public class JudgeImpl2 {
	public static void main(String... args) throws Exception {
		{
			System.out.println("First of all, if you execute it normally ...");
			JudgeImpl2 judge = new JudgeImpl2();
			test(judge);
		}
		{
			System.out.println("If you overwrite ...");
			JudgeImpl2 judge = new JudgeImpl2() {
				@Override
				public boolean judge(int a ) {
					return true;
				}
			};
			test(judge);
		}
	}

	private static void test(JudgeImpl2 judge){
		System.out.println( judge.judge(1) );
		System.out.println( judge.judge(2) );
		System.out.println( judge.judge(3) );
	}

    public boolean judge(int a) {
        if (a == 1 && a == 2 && a == 3) {
            return true;
        } else {
            return false;
        }
    }
}

First of all, if you execute it normally ...
false
false
false
If you overwrite ...
true
true
true

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