Good news for programmers: Recommended 5 top Java decompilation tools

Programmer benefits: Recommend 5 top Java decompilation tools, need specific code examples

With the widespread application of Java language, for programmers, mastering Java decompilation tools have become an important skill. During the development process, we often need to analyze and debug Java bytecode, and this is when decompilation tools come in handy. Below, I will recommend 5 top Java decompilation tools to everyone and provide specific code examples for your reference.

1. JD-GUI
   JD-GUI is an open source Java decompilation tool that can decompile Java bytecode files into Java source code. JD-GUI provides an intuitive graphical user interface to facilitate programmers to view and analyze code. The following is a sample code decompiled using JD-GUI:

import java.util.ArrayList;
import java.util.List;

public class Example {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");
        
        for (String str : list) {
            System.out.println(str);
        }
    }
}

Using JD-GUI to decompile the above code, you can get the following results:

import java.util.ArrayList;
import java.util.List;

public class Example {
    public static void main(String[] paramArrayOfString) {
        ArrayList localArrayList = new ArrayList();
        localArrayList.add("Hello");
        localArrayList.add("World");
        for (String str : localArrayList) {
            System.out.println(str);
        }
    }
}

2. Procyon
   Procyon is also an open source Java decompilation tool, which has higher accuracy and performance compared to JD-GUI. Procyon supports the new features of decompiling Java 8, making it easier for programmers to analyze and debug the latest Java code. The following is a sample code decompiled using Procyon:

import java.util.ArrayList;
import java.util.List;

public class Example {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");
        
        for (String str : list) {
            System.out.println(str);
        }
    }
}

Use Procyon to decompile the above code, you can get the following results:

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Example {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");
        
        for (Iterator<String> iterator = list.iterator(); iterator.hasNext(); ) {
            String str = iterator.next();
            System.out.println(str);
        }
    }
}

3. FernFlower
   FernFlower is a A powerful Java decompiler that can decompile Java bytecode files into highly readable Java source code. FernFlower supports decompiling the new features of Java 8 and performs very well in terms of running speed and stability. The following is a sample code decompiled using FernFlower:

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Example {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");
        
        for (Iterator<String> iterator = list.iterator(); iterator.hasNext(); ) {
            String str = iterator.next();
            System.out.println(str);
        }
    }
}

Use FernFlower to decompile the above code, you can get the following results:

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Example {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");
        
        Iterator<String> iterator = list.iterator();
        while (iterator.hasNext()) {
            String str = iterator.next();
            System.out.println(str);
        }
    }
}

4. JAD
   JAD is a This old Java decompilation tool, although it has ceased maintenance, is still loved by many programmers. JAD supports decompiling bytecode from Java 1.1 to Java 7, but does not support new features of Java 8 and above. The following is a sample code decompiled using JAD:

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Example {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");
        
        for (Iterator<String> iterator = list.iterator(); iterator.hasNext(); ) {
            String str = iterator.next();
            System.out.println(str);
        }
    }
}

Use JAD to decompile the above code, you can get the following results:

import java.util.*;
import java.io.*;

public class Example
{
    public static void main(String[] args)
    {
        ArrayList arraylist = new ArrayList();
        arraylist.add("Hello");
        arraylist.add("World");
        for(Iterator iterator = arraylist.iterator(); iterator.hasNext(); System.out.println((String)iterator.next()));
    }
}

5. CFR
   CFR is a This decompilation tool supports Java 8 and above, and can decompile Java bytecode files into readable Java source code. CFR's decompilation results are very accurate and support most Java language features. It is a very powerful decompilation tool. The following is a sample code decompiled using CFR:

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Example {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");
        
        for (Iterator<String> iterator = list.iterator(); iterator.hasNext(); ) {
            String str = iterator.next();
            System.out.println(str);
        }
    }
}

Use CFR to decompile the above code, you can get the following results:

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Example {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");
        
        for (Iterator<String> iterator = list.iterator(); iterator.hasNext(); ) {
            String str = iterator.next();
            System.out.println(str);
        }
    }
}

The above are the 5 top Java decompilers I recommend. Compilation tools each have different characteristics and advantages. You can choose the appropriate tool to use according to your personal needs. I hope these code examples can provide some help and reference for programmers in their decompilation work.

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