Question

我在Java中有两个字符数组：

orig_array和mix_array。我需要检查它们是否不相等。

这是我到目前为止所做的：

sample data
orig_team=one
mix_team=neo

while(!Arrays.equals(mix_team, orig_team))
{

    if (Arrays.equals(mix_team, orig_team))
    {

        System.out.println("congradulations! you did it");
        System.exit(0);
    }

    else {

        System.out.println("enter the index");
        Scanner scn = new Scanner(System.in);
        int x = scn.nextInt();
        int y = scn.nextInt();
        char first=mix_team[x];
        char second=mix_team[y];
        mix_team[x]=second;
        mix_team[y]=first;
        for (int i = 0; i < mix_team.length; i = i + 1) 
        {
            System.out.print(i);  
            System.out.print(" ");
        }
        System.out.println();
        System.out.println(mix_team);
    }
}

如何确定两个数组是否相等？

Answer 1

while循环的块仅在两个数组不相等时执行，因此使用相同的相等性检查启动该块是没有意义的。换句话说，行：

if (Arrays.equals(mix_team, orig_team))

...始终为false。

Answer 2

你基本上有以下循环：

while (something) {
    if (! something) {
        code();
    }
}

while循环中的代码只有在something评估为true时才会运行。因此，!something的值将始终为false，并且if语句的内容将不会运行。

相反，请尝试：

while (!Arrays.equals (mix_team, orig_team)) {
    System.out.println("enter the index");
    Scanner scn = new Scanner(System.in);
    int x = scn.nextInt();
    int y = scn.nextInt();
    char first=mix_team[x];
    char second=mix_team[y];
    mix_team[x]=second;
    mix_team[y]=first;
    for (int i = 0; i < mix_team.length; i = i + 1) 
    {
        System.out.print(i);  
        System.out.print(" ");
    }
    System.out.println();
    System.out.println(mix_team);
}
System.out.println("congratulations! you did it");
System.exit(0);

顺便说一句，您每次都不需要创建扫描仪。更好的方法是在while循环之前声明扫描器（基本上将初始化行向上移动两行）。

Java，检查两个char数组是否相等

2 个答案: