为什么for循环运行6次迭代？

Question

我需要帮助了解for循环为什么运行6次的逻辑。循环不应该在i = 4, j = 5处停止吗？

public static boolean methodName(int[] hand)
{
    int counter = 0;

    for (int i = 0; i < hand.length-1; i++) {
        for (int j = i+1; j < hand.length; j++) {
            if (hand[i] == hand[j] && j != i) {
                counter++;
                System.out.println(counter);
            }
        }
    }
    if (counter == 4) {

        return true;
    }
    return false;
} // end method

我插入了该行System.out.println(counter)，以查看循环执行了多少次迭代。

输出如下：

Enter five ints.
Input 1: 2
Input 2: 2
Input 3: 2
Input 4: 2
Input 5: 3
1
2
3
4
5
6 

Answer 1

I=0,J=1, 2=2 counter = 1  
I=0,J=2 2=2 counter = 2  
I=0,J=3 2=2 counter = 3  
I=0,J=4 2<>3 counter = 3 no print  
I=1,J=2, 2=2 counter = 4  
I=1,J=3, 2=2 counter = 5  
I=1,J=4, 2<>3 counter = 5 no print  
I=2,J=3, 2=2 counter = 6  
I=3,J=4, 2<>3 counter = 6 no print