Android Question Is there strategy convert jar file to be bas file ?

Theera · Jun 16, 2025

How is possible to do convert jar file to be bas file ? ,perhaps it's possibe to study the sourcecode how to code.

DonManfred · Jun 16, 2025

Theera said:
How is possible to do convert jar file to be bas file ?

It is not possible. the jar files contains compiled JAVA-Code
This can not be converted to .bas file

Theera · Jun 17, 2025

I've tried to use AI help
JAR file -->Java file-->Bas file
, but it has something wrong

B4X:

<!DOCTYPE html>
<html lang="th">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Java to B4X Converter</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #4f46e5, #7c3aed);
            color: white;
            text-align: center;
            padding: 30px;
        }

        .header h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }

        .header p {
            font-size: 1.1rem;
            opacity: 0.9;
        }

        .main-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0;
            min-height: 600px;
        }

        .input-section, .output-section {
            padding: 30px;
            display: flex;
            flex-direction: column;
        }

        .input-section {
            border-right: 2px solid #e5e7eb;
            background: #f9fafb;
        }

        .section-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 20px;
            color: #374151;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .icon {
            width: 24px;
            height: 24px;
            fill: #4f46e5;
        }

        .file-input-area {
            position: relative;
            border: 3px dashed #d1d5db;
            border-radius: 12px;
            padding: 40px 20px;
            text-align: center;
            transition: all 0.3s ease;
            background: white;
            margin-bottom: 20px;
        }

        .file-input-area:hover {
            border-color: #4f46e5;
            background: #faf5ff;
        }

        .file-input-area.dragover {
            border-color: #4f46e5;
            background: #faf5ff;
            transform: scale(1.02);
        }

        .file-input {
            position: absolute;
            width: 100%;
            height: 100%;
            opacity: 0;
            cursor: pointer;
        }

        .textarea-container {
            flex: 1;
            position: relative;
        }

        .code-textarea {
            width: 100%;
            height: 400px;
            font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
            font-size: 14px;
            line-height: 1.5;
            padding: 20px;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            resize: vertical;
            transition: border-color 0.3s ease;
            background: white;
        }

        .code-textarea:focus {
            outline: none;
            border-color: #4f46e5;
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
        }

        .controls {
            display: flex;
            gap: 15px;
            margin: 20px 0;
            flex-wrap: wrap;
        }

        .btn {
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
        }

        .btn-primary {
            background: linear-gradient(135deg, #4f46e5, #7c3aed);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(79, 70, 229, 0.3);
        }

        .btn-secondary {
            background: #f3f4f6;
            color: #374151;
            border: 2px solid #e5e7eb;
        }

        .btn-secondary:hover {
            background: #e5e7eb;
            transform: translateY(-1px);
        }

        .btn-success {
            background: linear-gradient(135deg, #10b981, #059669);
            color: white;
        }

        .btn-success:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
        }

        .output-area {
            background: #1f2937;
            color: #f9fafb;
            font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
            font-size: 14px;
            line-height: 1.6;
            padding: 20px;
            border-radius: 12px;
            height: 400px;
            overflow-y: auto;
            white-space: pre-wrap;
            word-wrap: break-word;
        }

        .syntax-highlight {
            color: #60a5fa;
        }

        .keyword {
            color: #f472b6;
            font-weight: bold;
        }

        .string {
            color: #34d399;
        }

        .comment {
            color: #9ca3af;
            font-style: italic;
        }

        .status {
            padding: 15px;
            border-radius: 8px;
            margin: 15px 0;
            font-weight: 500;
        }

        .status.success {
            background: #d1fae5;
            color: #065f46;
            border: 1px solid #a7f3d0;
        }

        .status.error {
            background: #fee2e2;
            color: #991b1b;
            border: 1px solid #fca5a5;
        }

        .progress-bar {
            width: 100%;
            height: 6px;
            background: #e5e7eb;
            border-radius: 3px;
            overflow: hidden;
            margin: 15px 0;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #4f46e5, #7c3aed);
            width: 0%;
            transition: width 0.5s ease;
        }

        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            
            .input-section {
                border-right: none;
                border-bottom: 2px solid #e5e7eb;
            }
            
            .header h1 {
                font-size: 2rem;
            }
            
            .controls {
                justify-content: center;
            }
        }

        .feature-list {
            background: #f0f9ff;
            border: 1px solid #bae6fd;
            border-radius: 8px;
            padding: 15px;
            margin: 15px 0;
        }

        .feature-list h4 {
            color: #0369a1;
            margin-bottom: 10px;
        }

        .feature-list ul {
            list-style: none;
            padding-left: 0;
        }

        .feature-list li {
            padding: 5px 0;
            color: #0c4a6e;
        }

        .feature-list li:before {
            content: "✓ ";
            color: #10b981;
            font-weight: bold;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>🔧 Java to B4X Converter</h1>
            <p>แปลงโค้ด Java เป็น B4A/B4J/B4i (.bas) อย่างง่ายดาย</p>
        </div>

        <div class="main-content">
            <div class="input-section">
                <h2 class="section-title">
                    <svg class="icon" viewBox="0 0 24 24">
                        <path d="M14,2H6A2,2 0 0,0 4,4V20A2,2 0 0,0 6,22H18A2,2 0 0,0 20,20V8L14,2M18,20H6V4H13V9H18V20Z"/>
                    </svg>
                    Java Input
                </h2>

                <div class="file-input-area" id="fileDropArea">
                    <input type="file" class="file-input" id="fileInput" accept=".java">
                    <div>
                        <svg width="48" height="48" viewBox="0 0 24 24" fill="#9ca3af">
                            <path d="M14,2H6A2,2 0 0,0 4,4V20A2,2 0 0,0 6,22H18A2,2 0 0,0 20,20V8L14,2M18,20H6V4H13V9H18V20Z"/>
                        </svg>
                        <p style="margin: 10px 0; color: #6b7280; font-weight: 500;">ลากไฟล์ .java มาวางที่นี่ หรือคลิกเพื่อเลือกไฟล์</p>
                        <p style="color: #9ca3af; font-size: 14px;">รองรับไฟล์ .java เท่านั้น</p>
                    </div>
                </div>

                <div class="textarea-container">
                    <textarea 
                        class="code-textarea" 
                        id="javaInput" 
                        placeholder="หรือวางโค้ด Java ที่นี่...

ตัวอย่าง:
public class MainActivity {
    private String message = &quot;Hello World&quot;;
    
    public void onCreate() {
        System.out.println(message);
    }
    
    private void showToast(String text) {
        // Show toast message
    }
}"></textarea>
                </div>

                <div class="feature-list">
                    <h4>🎯 ฟีเจอร์ที่รองรับ:</h4>
                    <ul>
                        <li>แปลง Class เป็น B4X Module</li>
                        <li>แปลง Method เป็น Sub</li>
                        <li>แปลง Data Types</li>
                        <li>แปลง Access Modifiers</li>
                        <li>จัดการ Import Statements</li>
                        <li>แปลง Comments</li>
                    </ul>
                </div>
            </div>

            <div class="output-section">
                <h2 class="section-title">
                    <svg class="icon" viewBox="0 0 24 24">
                        <path d="M17,9H7V7H17M17,13H7V11H17M14,17H7V15H14M12,3A1,1 0 0,1 13,4A1,1 0 0,1 12,5A1,1 0 0,1 11,4A1,1 0 0,1 12,3M19,3H14.82C14.4,1.84 13.3,1 12,1C10.7,1 9.6,1.84 9.18,3H5A2,2 0 0,0 3,5V19A2,2 0 0,0 5,21H19A2,2 0 0,0 21,19V5A2,2 0 0,0 19,3Z"/>
                    </svg>
                    B4X Output (.bas)
                </h2>

                <div class="controls">
                    <button class="btn btn-primary" id="convertBtn">
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
                            <path d="M12,2A2,2 0 0,1 14,4C14,4.74 13.6,5.39 13,5.73V7H14A7,7 0 0,1 21,14H22A1,1 0 0,1 23,15V18A1,1 0 0,1 22,19H21V20A2,2 0 0,1 19,22H5A2,2 0 0,1 3,20V19H2A1,1 0 0,1 1,18V15A1,1 0 0,1 2,14H3A7,7 0 0,1 10,7H11V5.73C10.4,5.39 10,4.74 10,4A2,2 0 0,1 12,2M7.5,13A2.5,2.5 0 0,0 5,15.5A2.5,2.5 0 0,0 7.5,18A2.5,2.5 0 0,0 10,15.5A2.5,2.5 0 0,0 7.5,13M16.5,13A2.5,2.5 0 0,0 14,15.5A2.5,2.5 0 0,0 16.5,18A2.5,2.5 0 0,0 19,15.5A2.5,2.5 0 0,0 16.5,13Z"/>
                        </svg>
                        แปลงโค้ด
                    </button>
                    <button class="btn btn-secondary" id="clearBtn">
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
                            <path d="M19,4H15.5L14.5,3H9.5L8.5,4H5V6H19M6,19A2,2 0 0,0 8,21H16A2,2 0 0,0 18,19V7H6V19Z"/>
                        </svg>
                        ล้างข้อมูล
                    </button>
                    <button class="btn btn-success" id="downloadBtn" style="display: none;">
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
                            <path d="M5,20H19V18H5M19,9H15V3H9V9H5L12,16L19,9Z"/>
                        </svg>
                        ดาวน์โหลด .bas
                    </button>
                </div>

                <div class="progress-bar" id="progressBar" style="display: none;">
                    <div class="progress-fill" id="progressFill"></div>
                </div>

                <div id="status"></div>

                <div class="output-area" id="output">รอการแปลงโค้ด...</div>
            </div>
        </div>
    </div>

    <script>
        class JavaToB4XConverter {
            constructor() {
                this.setupEventListeners();
                this.javaKeywords = ['public', 'private', 'protected', 'static', 'final', 'abstract', 'class', 'interface', 'extends', 'implements'];
                this.b4xKeywords = ['Public', 'Private', 'Sub', 'End Sub', 'Dim', 'As', 'String', 'Int', 'Boolean'];
            }

            setupEventListeners() {
                const fileInput = document.getElementById('fileInput');
                const fileDropArea = document.getElementById('fileDropArea');
                const convertBtn = document.getElementById('convertBtn');
                const clearBtn = document.getElementById('clearBtn');
                const downloadBtn = document.getElementById('downloadBtn');
                const javaInput = document.getElementById('javaInput');

                // File drag and drop
                fileDropArea.addEventListener('dragover', (e) => {
                    e.preventDefault();
                    fileDropArea.classList.add('dragover');
                });

                fileDropArea.addEventListener('dragleave', () => {
                    fileDropArea.classList.remove('dragover');
                });

                fileDropArea.addEventListener('drop', (e) => {
                    e.preventDefault();
                    fileDropArea.classList.remove('dragover');
                    const files = e.dataTransfer.files;
                    if (files.length > 0) {
                        this.handleFile(files[0]);
                    }
                });

                fileInput.addEventListener('change', (e) => {
                    if (e.target.files.length > 0) {
                        this.handleFile(e.target.files[0]);
                    }
                });

                convertBtn.addEventListener('click', () => this.convertCode());
                clearBtn.addEventListener('click', () => this.clearAll());
                downloadBtn.addEventListener('click', () => this.downloadFile());

                // Auto convert on input change
                javaInput.addEventListener('input', () => {
                    if (javaInput.value.trim()) {
                        convertBtn.style.background = 'linear-gradient(135deg, #10b981, #059669)';
                    }
                });
            }

            handleFile(file) {
                if (!file.name.endsWith('.java')) {
                    this.showStatus('กรุณาเลือกไฟล์ .java เท่านั้น', 'error');
                    return;
                }

                const reader = new FileReader();
                reader.onload = (e) => {
                    document.getElementById('javaInput').value = e.target.result;
                    this.showStatus(`โหลดไฟล์ ${file.name} สำเร็จ`, 'success');
                };
                reader.readAsText(file);
            }

            convertCode() {
                const javaCode = document.getElementById('javaInput').value.trim();
                
                if (!javaCode) {
                    this.showStatus('กรุณาใส่โค้ด Java หรือเลือกไฟล์', 'error');
                    return;
                }

                this.showProgress();
                
                setTimeout(() => {
                    try {
                        const b4xCode = this.performConversion(javaCode);
                        this.displayResult(b4xCode);
                        this.showStatus('แปลงโค้ดสำเร็จ! 🎉', 'success');
                        document.getElementById('downloadBtn').style.display = 'flex';
                    } catch (error) {
                        this.showStatus(`เกิดข้อผิดพลาด: ${error.message}`, 'error');
                    }
                    this.hideProgress();
                }, 1000);
            }

            performConversion(javaCode) {
                let b4xCode = javaCode;

                // Convert package declaration
                b4xCode = b4xCode.replace(/package\s+[^;]+;/g, "'Package declaration removed - not needed in B4X");

                // Convert imports
                b4xCode = b4xCode.replace(/import\s+[^;]+;/g, (match) => {
                    return `'${match} - Check B4X libraries`;
                });

                // Convert class declaration
                b4xCode = b4xCode.replace(/public\s+class\s+(\w+)(\s+extends\s+\w+)?(\s+implements\s+[\w,\s]+)?\s*\{/, 
                    (match, className) => {
                        return `'B4X Module: ${className}\n'#Region Module Attributes\n'#End Region\n\nSub Process_Globals\n    'These global variables will be declared once when the application starts.\nEnd Sub\n\nSub Globals\n    'These global variables will be redeclared each time the activity is created.\nEnd Sub\n\nSub Activity_Create(FirstTime As Boolean)\n    'Initialize module\nEnd Sub`;
                    });

                // Convert methods
                b4xCode = b4xCode.replace(/(\w+)\s+(\w+)\s*\([^)]*\)\s*\{/g, (match, returnType, methodName) => {
                    const b4xReturnType = this.convertDataType(returnType);
                    if (returnType === 'void') {
                        return `Sub ${methodName}`;
                    } else {
                        return `Sub ${methodName} As ${b4xReturnType}`;
                    }
                });

                // Convert variable declarations
                b4xCode = b4xCode.replace(/(\w+)\s+(\w+)\s*=\s*([^;]+);/g, (match, type, varName, value) => {
                    const b4xType = this.convertDataType(type);
                    return `Dim ${varName} As ${b4xType} = ${value}`;
                });

                b4xCode = b4xCode.replace(/(\w+)\s+(\w+);/g, (match, type, varName) => {
                    const b4xType = this.convertDataType(type);
                    return `Dim ${varName} As ${b4xType}`;
                });

                // Convert System.out.println to Log
                b4xCode = b4xCode.replace(/System\.out\.println\s*\(/g, 'Log(');

                // Convert access modifiers
                b4xCode = b4xCode.replace(/private\s+/g, 'Private ');
                b4xCode = b4xCode.replace(/public\s+/g, 'Public ');
                b4xCode = b4xCode.replace(/protected\s+/g, 'Private ');

                // Convert closing braces to End Sub
                b4xCode = b4xCode.replace(/\s*\}\s*$/gm, '\nEnd Sub');
                b4xCode = b4xCode.replace(/\s*\}\s*(?=\n|$)/g, '\nEnd Sub');

                // Convert comments
                b4xCode = b4xCode.replace(/\/\//g, "'");
                b4xCode = b4xCode.replace(/\/\*([^*]|\*[^/])*\*\//g, (match) => {
                    return match.replace(/\/\*/g, "'").replace(/\*\//g, "").replace(/\*/g, "'");
                });

                // Clean up extra braces and semicolons
                b4xCode = b4xCode.replace(/[{}]/g, '');
                b4xCode = b4xCode.replace(/;$/gm, '');

                // Add B4X header
                const header = `'B4X Module converted from Java
'Generated by Java to B4X Converter
'Date: ${new Date().toLocaleString('th-TH')}
'
'Note: This is an automated conversion. Please review and test the code.
'Some Java features may need manual adjustment for B4X compatibility.

`;

                return header + b4xCode;
            }

            convertDataType(javaType) {
                const typeMap = {
                    'String': 'String',
                    'int': 'Int',
                    'Integer': 'Int',
                    'boolean': 'Boolean',
                    'Boolean': 'Boolean',
                    'double': 'Double',
                    'Double': 'Double',
                    'float': 'Float',
                    'Float': 'Float',
                    'long': 'Long',
                    'Long': 'Long',
                    'byte': 'Byte',
                    'Byte': 'Byte',
                    'char': 'Char',
                    'Character': 'Char',
                    'void': 'Void',
                    'Object': 'Object'
                };

                return typeMap[javaType] || javaType;
            }

            displayResult(code) {
                const output = document.getElementById('output');
                const highlightedCode = this.highlightSyntax(code);
                output.innerHTML = highlightedCode;
            }

            highlightSyntax(code) {
                let highlighted = code;
                
                // Highlight B4X keywords
                this.b4xKeywords.forEach(keyword => {
                    const regex = new RegExp(`\\b${keyword}\\b`, 'g');
                    highlighted = highlighted.replace(regex, `<span class="keyword">${keyword}</span>`);
                });

                // Highlight strings
                highlighted = highlighted.replace(/"([^"]*)"/g, '<span class="string">"$1"</span>');
                
                // Highlight comments
                highlighted = highlighted.replace(/'([^\n]*)/g, '<span class="comment">\'$1</span>');

                return highlighted;
            }

            showProgress() {
                const progressBar = document.getElementById('progressBar');
                const progressFill = document.getElementById('progressFill');
                
                progressBar.style.display = 'block';
                progressFill.style.width = '0%';
                
                setTimeout(() => progressFill.style.width = '30%', 100);
                setTimeout(() => progressFill.style.width = '60%', 300);
                setTimeout(() => progressFill.style.width = '90%', 600);
                setTimeout(() => progressFill.style.width = '100%', 900);
            }

            hideProgress() {
                setTimeout(() => {
                    document.getElementById('progressBar').style.display = 'none';
                }, 500);
            }

            showStatus(message, type) {
                const status = document.getElementById('status');
                status.className = `status ${type}`;
                status.textContent = message;
                status.style.display = 'block';

                if (type === 'success') {
                    setTimeout(() => {
                        status.style.display = 'none';
                    }, 3000);
                }
            }

            clearAll() {
                document.getElementById('javaInput').value = '';
                document.getElementById('output').textContent = 'รอการแปลงโค้ด...';
                document.getElementById('status').style.display = 'none';
                document.getElementById('downloadBtn').style.display = 'none';
                document.getElementById('fileInput').value = '';
            }

            downloadFile() {
                const output = document.getElementById('output');
                const content = output.textContent;
                
                if (!content || content === 'รอการแปลงโค้ด...') {
                    this.showStatus('ไม่มีโค้ดให้ดาวน์โหลด', 'error');
                    return;
                }

                const blob = new Blob([content], { type: 'text/plain;charset=utf-8' });
                const url = URL.createObjectURL(blob);
                const a = document.createElement('a');
                a.href = url;
                a.download = `converted_${new Date().getTime()}.bas`;
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                URL.revokeObjectURL(url);

                this.showStatus('ดาวน์โหลดไฟล์สำเร็จ! 📁', 'success');
            }
        }

        // Initialize converter when page loads
        document.addEventListener('DOMContentLoaded', () => {
            new JavaToB4XConverter();
        });
    </script>
</body>
</html>

mading1309 · Jun 23, 2025

DeepSeek

Converting a JAR File Back to Source Code

If you need to convert a compiled Java JAR file back to its source code, here are the methods you can use:

Method 1: Using JD-GUI (Graphical Decompiler)

1. Download [JD-GUI](http://java-decompiler.github.io/)
2. Open the JAR file with JD-GUI
3. View the decompiled source code directly
4. Use "File > Save All Sources" to export the code

Method 2: Using Jadx (For Android and Java)

1. Download [Jadx](https://github.com/skylot/jadx)
2. Run: `jadx -d output_dir yourfile.jar`
3. Find the decompiled source in the output directory

Method 3: Using FernFlower (Command Line)

1. Download [FernFlower](https://github.com/fesh0r/fernflower)
2. Run: `java -jar fernflower.jar input.jar output_dir`
3. The decompiled sources will be in the output directory

Method 4: Using CFR

1. Download [CFR](https://www.benf.org/other/cfr/)
2. Run: `java -jar cfr.jar yourfile.jar --outputdir output_dir`

Important Notes:

- Decompiled code won't be identical to the original source (comments, variable names may differ)
- Some obfuscated JARs may not decompile cleanly
- Respect software licenses - don't decompile proprietary software without permission.

I didn't try to doy

Theera · Jun 23, 2025

mading1309 said:
DeepSeek

Converting a JAR File Back to Source Code

If you need to convert a compiled Java JAR file back to its source code, here are the methods you can use:

Method 1: Using JD-GUI (Graphical Decompiler)

1. Download [JD-GUI](http://java-decompiler.github.io/)
2. Open the JAR file with JD-GUI
3. View the decompiled source code directly
4. Use "File > Save All Sources" to export the code

Method 2: Using Jadx (For Android and Java)

1. Download [Jadx](https://github.com/skylot/jadx)
2. Run: `jadx -d output_dir yourfile.jar`
3. Find the decompiled source in the output directory

Method 3: Using FernFlower (Command Line)

1. Download [FernFlower](https://github.com/fesh0r/fernflower)
2. Run: `java -jar fernflower.jar input.jar output_dir`
3. The decompiled sources will be in the output directory

Method 4: Using CFR

1. Download [CFR](https://www.benf.org/other/cfr/)
2. Run: `java -jar cfr.jar yourfile.jar --outputdir output_dir`

Important Notes:

- Decompiled code won't be identical to the original source (comments, variable names may differ)
- Some obfuscated JARs may not decompile cleanly
- Respect software licenses - don't decompile proprietary software without permission.

I didn't try to doy

Many thanks, Sir.

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