Java bytecode example

AddTwo.java

public class AddTwo {
    public static void main(String args[]) {
        int c = add(2,3);
    }
    public static int add(int a, int b) {
        return a + b;
    }
}

Compile this with javac AddTwo.java

Then decompile the bytecode with javap -c AddTwo.class to get:

Compiled from "AddTwo.java"
public class AddTwo {
  public AddTwo();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main(java.lang.String[]);
    Code:
       0: iconst_2
       1: iconst_3
       2: invokestatic  #2                  // Method add:(II)I
       5: istore_1
       6: return

  public static int add(int, int);
    Code:
       0: iload_0
       1: iload_1
       2: iadd
       3: ireturn
}