Compiling static finals

Disassembled StaticFinal2Gate

☕  javap -c Gate\$StaticFinal2Gate.class
Compiled from "Gate.java"
public class Gate$StaticFinal2Gate {
  public Gate$StaticFinal2Gate();
    Code:
       0: aload_0       
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: aload_0       
       5: iconst_0      
       6: putfield      #2                  // Field flag:Z
       9: return        

  public void runit();
    Code:
       0: return        
}

Disassembled StaticFinalGate

☕  javap -c Gate\$StaticFinalGate.class 
Compiled from "Gate.java"
public class Gate$StaticFinalGate {
  public Gate$StaticFinalGate(boolean);
    Code:
       0: aload_0       
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: aload_0       
       5: iload_1       
       6: putfield      #2                  // Field flag:Z
       9: return        

  public void runit();
    Code:
       0: aload_0       
       1: getfield      #2                  // Field flag:Z
       4: ifeq          15
       7: getstatic     #3                  // Field java/lang/System.out:Ljava/io/PrintStream;
      10: ldc           #4                  // String OK
      12: invokevirtual #5                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      15: return        
}

Disassembled StaticGate

☕  javap -c Gate\$StaticGate.class 
Compiled from "Gate.java"
public class Gate$StaticGate {
  public Gate$StaticGate(boolean);
    Code:
       0: aload_0       
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: aload_0       
       5: iload_1       
       6: putfield      #2                  // Field flag:Z
       9: return        

  public void runit();
    Code:
       0: aload_0       
       1: getfield      #2                  // Field flag:Z
       4: ifeq          15
       7: getstatic     #3                  // Field java/lang/System.out:Ljava/io/PrintStream;
      10: ldc           #4                  // String OK
      12: invokevirtual #5                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      15: return        
}

Gate

public class Gate {

    public static class StaticGate {

        private boolean flag;

        public StaticGate(boolean flag) {
            this.flag = flag;
        }

        public void runit() {
            if (flag) {
                System.out.println("OK");
            }
        }
    }

    public static class StaticFinalGate {

        private final boolean flag;

        public StaticFinalGate(boolean flag) {
            this.flag = flag;
        }

        public void runit() {
            if (flag) {
                System.out.println("OK");
            }
        }
    }

    public static class StaticFinal2Gate {

        private final boolean flag = false;

        public void runit() {
            if (flag) {
                System.out.println("OK");
            }
        }
    }
    
}