在2d数组中打印最大数字 - 为什么我的代码打印三个数字

Question

我想打印出2D数组中最大的数字.我的问题是我的输出是三个数而不是一个 - 最大的.为什么？

这是我的代码:

public class Main {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {

    int maxRows = 3;
    int maxCols = 4;

    int [] onedArray = new int [maxRows];
        for (int i = 0; i < maxRows; i++){
        onedArray[i] = (int) ((Math.random() * 100) * maxCols);
    }

    int [][] twodArray = new int[maxRows][];
        for (int i = 0; i < maxRows; i++){
        twodArray[i] = new int[maxCols];
    }

        for (int i = 0; i < twodArray.length; i++){
        for (int j = 0; j < twodArray[i].length; j++){
            twodArray[i][j] = (int) (Math.random() * 100);
        }
    }

    System.out.println("2 - The 2D array: ");
    for (int i = 0; i < twodArray.length; i++){
        for (int j = 0; j < twodArray[i].length; j++){
            System.out.print(twodArray[i][j] + " ");
        }
        System.out.println("");
    }
    int maxValue = 1;
    System.out.println("\nMax values in 2D array: ");
    for (int i = 0; i < twodArray.length; i++) {
        for (int j = 0; j < twodArray.length; j++)
        if (twodArray[i][j] > maxValue) {
        maxValue = twodArray[i][j];
        }
            System.out.println(maxValue);
        }



}

}

Answer 1

直到最后一条指令序列的所有内容都是正确的(尽管格式不正确).

这是原创的:

int maxValue = 1;
System.out.println("\nMax values in 2D array: ");
for (int i = 0; i < twodArray.length; i++) {
    for (int j = 0; j < twodArray.length; j++)
    if (twodArray[i][j] > maxValue) {
    maxValue = twodArray[i][j];
    }
        System.out.println(maxValue);
    }

这是更好的版本:

int maxValue = 0;
System.out.println("\nMax values in 2D array: ");
for (int i = 0; i < twodArray.length; i++) {
    for (int j = 0; j < twodArray[i].length; j++) {
        if (twodArray[i][j] > maxValue) {
           maxValue = twodArray[i][j];
        }
    }
    System.out.println("Max value of row " + i + ": " + maxValue);
}

仔细看,你会看到我{在第二个for循环后添加了字符.

如果你想找到总的最大值,并最小化打开和关闭花括号,这是另一个版本:

int maxValue = 0;

System.out.println("\nMax values in 2D array: ");
for (int i = 0; i < twodArray.length; i++)
    for (int j = 0; j < twodArray[i].length; j++)
        if (twodArray[i][j] > maxValue)
           maxValue = twodArray[i][j];

System.out.println("Maximum value: " + maxValue);

祝好运.