我拥有的Java 8编译器似乎并没有对其进行优化.编译后使用“ javap -c”检查字节码：

public static void main(java.lang.String[]);

Code:

0: new #2 // class java/util/Random

3: dup

4: invokespecial #3 // Method java/util/Random."":()V

7: invokevirtual #4 // Method java/util/Random.nextInt:()I

10: bipush 10

12: irem

13: istore_1

14: iload_1

15: iconst_5

16: if_icmpge 30

19: getstatic #5 // Field java/lang/System.out:Ljava/io/PrintStream;

22: ldc #6 // String Case 1

24: invokevirtual #7 // Method java/io/PrintStream.println:(Ljava/lang/String;)V

27: goto 54

30: iload_1

31: iconst_5

32: if_icmplt 46

35: getstatic #5 // Field java/lang/System.out:Ljava/io/PrintStream;

38: ldc #8 // String Case 2

40: invokevirtual #7 // Method java/io/PrintStream.println:(Ljava/lang/String;)V

43: goto 54

46: getstatic #5 // Field java/lang/System.out:Ljava/io/PrintStream;

49: ldc #9 // String Case 3

51: invokevirtual #7 // Method java/io/PrintStream.println:(Ljava/lang/String;)V

54: return

}

字符串“情况3”仍存在于字节码中.