javabytecode.md

class Test {
    static boolean val = false;

    public static void main() {
        if (!val) {
            System.out.println("Test");
        }
    }
}

Generates

class test.Test {
  static boolean val;

  test.Test();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main();
    Code:
       0: getstatic     #2                  // Field val:Z
       3: ifne          14
       6: getstatic     #3                  // Field java/lang/System.out:Ljava/io/PrintStream;
       9: ldc           #4                  // String Test
      11: invokevirtual #5                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      14: return

  static {};
    Code:
       0: iconst_0
       1: putstatic     #2                  // Field val:Z
       4: return
}

And declaring val as final

class Test1 {
    static final boolean val = false;

    public static void main() {
        if (!val) {
            System.out.println("Test");
        }
    }
}
```java

Generates

```Compiled from "Test1.java"
class test.Test1 {
  static final boolean val;

  test.Test1();
    Code:
       0: aload_0
       1: invokespecial #2                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main();
    Code:
       0: getstatic     #3                  // Field java/lang/System.out:Ljava/io/PrintStream;
       3: ldc           #4                  // String Test
       5: invokevirtual #5                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
       8: return
}

The extra ifne check is not done in the latter byte code as the compiler knows val is always false.