java-简单的定义二位数组

package shuzu;

/*

 * @author pansen

 * 

 */

public class mum {
public static void main(String[] args) {
//定义三行三列的二位数组
int[][] num1=new int[3][3];
num1[0][0]=1;
num1[0][1]=2;
num1[0][2]=3;
for(int i=0;i<num1.length;i++){
for(int j=0;j<num1.length;j++){
System.out.println(num1[i][j]);
}
}
//定义不规则二位数组

int[][] num2=new int[3][];
num2[0]=new int[3];
num2[1]=new int[3];
num2[2]=new int[3];
num2[0][2]=1;
num2[1][0]=2;
num2[2][1]=3;
for(int i=0;i<num2.length;i++){
for(int j=0;j<num2.length;j++){
System.out.println(num2[i][j]);
}
}
//定义二位时直接赋值
int num3[][]={{1,2,3},{4,5,6},{789}};
System.out.println(num3[0][1]);
System.out.println(num3[1][2]);
System.out.println(num3[2][0]);
//定义一个不规则二位数组赋值
int num4[][]=new int[][]{{11,22},{33,44,55},{66,77,88,99}};
System.out.println(num4[0][0]);
System.out.println(num4[1][2]);
System.out.println(num4[2][3]);
}

}