java - 显示数组中包含的值

Question

我想显示一条消息，指示输入 value 是否存在于我的 rollValue 数组中。

我的代码无法正确识别此类数字。这个search方法是我尝试过的，但是为什么它没有显示正确的信息呢？

public void search(int value)
{
    for (int i = 0; i < rollValue.length; i++)
    {
        if (rollValue[i] == value)
        {        
            System.out.println(value + " was found");
        }            
        else
        {
            System.out.println(value + " was not found");
        }
        break;
    }
}

Answer 1

您需要(可能)迭代每个值，然后才能决定是否找到它。做两个方法。有点像

private boolean hasValue(int value) {
    for (int roll : rollValue) {
        if (value == roll) {
            return true;
        }
    }
    return false;
}

然后你可以通过调用hasValue来实现search

public void search(int value)
{
    if (hasValue(value)) 
    {        
        System.out.println(value + " was found");
    }
    else
    {
        System.out.println(value + " was not found");
    }
}

或作为一行ternary喜欢

System.out.println(value + (hasValue(value) ? " was found" : " was not found"));

或者您可以在search 中添加短路return 并执行类似

public void search(int value) {
    for (int roll : rollValue) {
        if (roll == value) {
            System.out.printf("%d was found%n", value);
            return;
        }
    }
    System.out.printf("%d was not found%n", value);
}