Synthetic members

.version 52 0
.source Example.java
.class super public Example
.super java/lang/Object


.method synthetic public <init> : ()V
    .limit stack 1
    .limit locals 1
    aload_0
    invokespecial java/lang/Object <init> ()V
    return
.end method

.method synthetic static public main : ([Ljava/lang/String;)V
    .limit stack 2
    .limit locals 1
    getstatic java/lang/System out Ljava/io/PrintStream;
    ldc 'Hello world'
    invokevirtual java/io/PrintStream println (Ljava/lang/String;)V
    return
.end method

The synthetic attribute is normally applied to methods which do not appear in the source code. Its presence, however, is valid on any method.

JD-GUI 1.4.0 public class Example {}

There is no option to disable this behaviour in jd-gui.

Procyon 0.5.30

// 
// Decompiled by Procyon v0.5.30
// 

public class Example
{
}

You can decompile using --show-synthetic or -ss to avoid this in procyon.

CFR 0.103

/*
 * Decompiled with CFR 0_103.
 */
import java.io.PrintStream;

public class Example {
    public static /* synthetic */ void main(String[] arrstring) {
        System.out.println("Hello world");
    }
}

Fernflower @810818e

public class Example {
   // $FF: synthetic method
   public static void main(String[] var0) {
      System.out.println("Hello world");
   }
}