Question

public class Student {
public static void main(String[] args) {
    Object[][] array2d = new Object[3][7];

    array2d[0][0] = "student name";
    array2d[0][1] = "firstest";
    array2d[0][2] = "secondtest ";
    array2d[0][3] = "schoolworks";
    array2d[0][4] = "homeworks";
    array2d[0][5] = "finaltest";
    array2d[0][6] = "total grade";

    array2d[1][0] = "jack";
    array2d[1][1] = new Integer(15);
    array2d[1][2] = new Integer(10);
    array2d[1][3] = new Integer(7);
    array2d[1][4] = new Integer(8);
    array2d[1][5] = new Integer(35);
    array2d[1][6] = new Integer(75);

    array2d[2][0] = "john";
    array2d[2][1] = new Integer(19);
    array2d[2][2] = new Integer(15);
    array2d[2][3] = new Integer(9);
    array2d[2][4] = new Integer(5);
    array2d[2][5] = new Integer(30);
    array2d[2][6] = new Integer(78);


    for (int row = 0; row < array2d.length;  row++) {

        for (int colums = 0; colums < array2d[row].length; colums++)
            System.out.println(array2d[row][colums]);
    }

我想在此订单上打印2d混合数组String和int。表新的java和网站熊我

student name firstest secondtest schoolworks homeworks finaltest total grade 
    jack        15        10          8           7         35         67

按此订单打印表格用我糟糕的英语和java编辑尽可能多的

Answer 1

要打印出一些看起来像你在帖子中显示的内容需要一些思考，并涉及很多步骤。这是让你入门的东西：

//First we need to set a spacing for each item,
//else the table will look bad and not be in line:
int spacing = 14;

//Now loop through the array and store each item in `rowToPrint`
//The for loop will repeat for each row
for (int row = 0; row < array2d.length; row++)
{
    //Create a string to store a whole row for printing:
    String rowToPrint = "";

    //The for loop will repeat for each column
    for (int column = 0; column < array2d[row].length; column++)
    {
        //get previous row items
        String previousItems = rowToPrint;

        //get next array item
        String newItem = array2d[row][column];

        //work out array item length
        int length = array2d[row][column].length();

        //work out padding for this item by doing (Spacing - array item length), and add blank spaces.
        //Example: 14(spacing) - 8 (item length) = 6 spaces of padding
        String padding = String.format("%" + (spacing - length) + "s", "");

        //now add add it all together
        rowToPrint = previousItems + newItem + padding;
    }

    //Now print current row in full with spacing/padding
    System.out.println(rowToPrint);
}

这段代码可能更简单，但我保持分离和清晰，以便您可以轻松查看正在发生的事情并轻松进行更改。

您还需要更改部分代码，否则示例将无效：

从此Object[][] array2d = new Object[3][7];更改为此String[][] array2d = new String[3][7];，因为这将无效.length()，并且需要更多代码才能处理它。

也不要指定像这个array2d[1][1] = new Integer(15);这样的整数，而是像array2d[1][1] = "15";那样或array2d[1][1] = "" + new Integer(15);。如果您需要将数据转换回整数，请使用以下内容：Integer.parseInt(array2d[1][1])

上述代码的示例输出：

student name  firstest      secondtest    schoolworks   homeworks     finaltest     total grade   
jack          15            10            7             8             35            75            
john          19            15            9             5             30            78

Answer 2

以上代码有几个问题：

您的2D数组矩阵，当打印循环对象很奇怪时，请使用int作为索引。

public class Test{
public static void main(String[] args)
{
    Object[][] array2d = new Object[3][7];

    array2d[0][0] = "اسم الطالب";
    array2d[0][1] = "اختبارالاول";
    array2d[0][2] = "اختبارالثاني";
    array2d[0][3] = "المشاركه";
    array2d[0][4] = "الواجبات";
    array2d[0][5] = "الاختبار النهائي";
    array2d[0][6] = "المجموع";

    array2d[1][0] = "عبدالله";
    array2d[1][1] = new Integer(15);
    array2d[1][2] = new Integer(10);
    array2d[1][3] = new Integer(7);
    array2d[1][4] = new Integer(8);
    array2d[1][5] = new Integer(35);
    array2d[1][6] = new Integer(75);

    array2d[1][0] = "محمد"; // Not sure if you should be reassigning the array elements, although you can
    array2d[1][1] = new Integer(19);
    array2d[1][2] = new Integer(15);
    array2d[1][3] = new Integer(9);
    array2d[1][4] = new Integer(5);
    array2d[1][5] = new Integer(30);
    array2d[1][6] = new Integer(78);

    for (int row = 0; row < array2d.length; row++)
    {

        for (int colums = 0; colums < array2d[row].length; colums++)
            System.out.println(array2d[row][colums]);
    }
}}

java eclipse mix String和int的数组

2 个答案: