二组数组其实就是数嵌套,一组数组中的每个元素都是一个数组。代码如下:
public class App {
public static void main(String[] args) {
int n = 5;
// 定义一个具有5行的数组
char[][] arr = new char[n][];
// 创建图形
for (int i = 0; i < arr.length; i++) {
arr[i] = new char[i + 1];
for (int j = 0; j <= i; j++) {
arr[i][j] = '*';
}
}
// 输出图形
for (int i = 0; i < arr.length; i++) {
for (int j = 0; j < arr[i].length; j++) {
System.out.print(arr[i][j]);
}
System.out.println();
}
}
}
运行结果:
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/71cf3bc79f3df8dc3f9372fbc111728b4710282a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追问有点不太理解arr[i]=new char[i+1]
这个i+1怎么理解呢
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