java - 试图理解 3 个嵌套的 if 语句

Question

假设我有一个由 5 个字符串组成的数组，与该数组相关的是 3 个大小相同的整数数组。例如`

String a[] = new String[5]
int x[] = new int[5]
int y[] = new int[5]

int z[] = new int[5]

因此 a[0],x[0],y[0],z[0] 都与同一事物相关。我想找出 x[] 中的哪个索引包含最高的数字。如果多个具有相同的最高数字，那么其中哪一个在 y[] 中具有最高数字，如果有多个具有相同的最高数字，则哪一个在 z[] 中具有最高数字(可以安全地假设z[] 中没有一个具有相同的最大值

我已尽力解释..

如果只检查前两个条件，这是最好的

for(int i=0;i<a.length;i++)
{

if(x[i]>=maximum){
if(x[i]==maximum)
{
    if(y[i]>=maximum)
    {
        maximum=x[i];
        winner=a[i];
        maximum=y[i];
    }
}
else
{
    maximum=x[i];
    winner=teams[i];
    maximum=y[i];
    }
}

这是我的新代码

static int compareValues(){
for (int i=0; i<a.length; i++){
        int max =0;
        int diff = x[i] - x[max];
        if (diff == 0){
            diff = y[i] - y[max];   
        }
        if (diff == 0){
            diff = z[i] - z[max];
        }
        if (diff > 0){
         max = i    
        }
}
return max;

}

Answer 1

如果String[n]与每个n的int[n]相关，那么你真的应该正确地组合它们，使它们可比较 并对它们进行排序。

class Thing implements Comparable<Thing> {

    final String a;
    final int x;
    final int y;
    final int z;

    public Thing(String a, int x, int y, int z) {
        this.a = a;
        this.x = x;
        this.y = y;
        this.z = z;

    }

    @Override
    public int compareTo(Thing o) {
        int diff = o.x - x;
        if (diff == 0) {
            diff = o.y - y;
        }
        if (diff == 0) {
            diff = o.z - z;
        }
        return diff;
    }

    @Override
    public String toString() {
        return "{" + a + "," + x + "," + y + "," + z + "}";
    }
}

public static int max(Thing[] things) {
    // NB - This should really call compareTo.
    int max = 0;
    for (int i = 1; i < things.length; i++) {
        int diff = things[i].x - things[max].x;
        if (diff == 0) {
            diff = things[i].y - things[max].y;
        }
        if (diff == 0) {
            diff = things[i].z - things[max].z;
        }
        if (diff > 0) {
            // Higher
            max = i;
        }
    }
    return max;
}

public void test() {
    Thing[] things = new Thing[6];
    things[0] = new Thing("Hello", 1, 2, 3);
    things[1] = new Thing("There", 1, 2, 4);
    things[2] = new Thing("Everyone", 0, 2, 3);
    things[3] = new Thing("How", 9, 0, 3);
    things[4] = new Thing("Are", 8, 9, 3);
    things[5] = new Thing("You", 7, 2, 3);
    System.out.println("Before: " + Arrays.toString(things));
    System.out.println("Max: " + things[max(things)]);
    Arrays.sort(things);
    System.out.println("Sorted: " + Arrays.toString(things));
}