两个for循环
public class Int_arr {
public static void main(String[] args) {
int[][] arr = {{12,5,7,3,},{3,5,66,},{2}};
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("");
}
}
}
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