Java如果语句和其他如果没有按预期工作

Question

我让用户在一个< code>int[]中输入5个int的列表。然后，我用一个简单的< code>for语句遍历int[]中的这些int。我声明了一个名为“evens”的< code>int变量如果int[]中的数字at i %2 == 0，< code > evens ；

现在我有了 if 语句：

if (evens !=2 || evens!=3) {
  System.out.print("This was called because " + evens + " is not equal to 2 or 3");
}

问题是，无论偶数的值是多少，都会调用它。它可以是5或3，但仍会被调用。我最近一直在使用C#，但这是简单的Java。

整机代码：

int evens = 0;
    for(int i=0; i<chosenNumbers.length; i++) {
        if(chosenNumbers[i] %2 ==0)
            evens++;
    }

System.out.println("You chose "+evens+" even numbers and " + (chosenNumbers.length-evens) + " odd numbers.");

    if (evens !=2 || evens!=3) {
        System.out.print("This was called because " + evens + " is not equal to 2 or 3");
    } else if (evens==2 || evens==3) {
        System.out.print(evens +" equals 2 or 3");
    }

Answer 1

您可以使用

if(!(evens ==2 || evens==3)) {
        System.out.print("This was called because " + evens + " is not equal to 2 or 3");
} else {
        System.out.print(evens +" equals 2 or 3");
}

Answer 2

您需要替换：

if(evens !=2 || evens!=3) {
    System.out.print("This was called because " + evens + " is not equal to 2 or 3");
}

与：

if(evens !=2 && evens!=3) {
    System.out.print("This was called because " + evens + " is not equal to 2 or 3");
}

如果您使用逻辑OR＜code＞| |＜/code＞，您将始终输入该块，因为它唯一不会输入的方法是＜code＞evens＜/code>同时等于2和3，这是不可能的。