java - 我需要显示每列的最小值，编号不均匀。列数

Question

public class SmallestColumn2{
    public static void main(String[] args){
        int [][] smallest = new int [][]{{17,70,97,-20},{27,73},{84,80,40,280},{90,98,58,-48,104}};
        System.out.println("Smallest per column");
        for(int col = 0; col < 5; col++){
            int least = smallest[0][col];
            for(int r = 0; r < 4; r++){ 
                if (smallest [r][col] < least){
                    least = smallest[r][col];
                }
            }
            System.out.println("Column " + col + ":" + least);
        }
    }
}

Answer 1

我猜它会抛出ArrayIndexOutOfBoundsException

我会使用条件来避免这种情况:

if(col>=smallest[r].length) //continue the loop
    continue;

我会将least变量设置为尽可能高的值:

int least = Integer.MAX_VALUE;

避免异常

整个代码

public class SmallestColumn2{
    public static void main(String[] args){
        int [][] smallest = new int [][]{{17,70,97,-20},{27,73},{84,80,40,280},{90,98,58,-48,104}};
        System.out.println("Smallest per column");
        for(int col = 0; col < 5; col++){
            int least = Integer.MAX_VALUE;
            for(int r = 0; r < smallest.length; r++){ 
                if(col>=smallest[r].length) //continue the loop
                    continue;
                if (smallest [r][col] < least){
                    least = smallest[r][col];
                }
            }
            System.out.println("Column " + col + ":" + least);
        }
    }
}

为了使其更加动态，我将硬编码的 4 重写为数组的长度。数字 5 应该计算为所有数组的最大长度数，而不仅仅是硬编码的 5

注意:未经测试