Java数组

//静态初始化
int[] a = {1, 2, 3};

//默认初始化
int[] a = new int[2];

//动态初始化
int[] a = new int[2];
a[0] = 1;
a[1] = 2;
a[2] = 3;

//初始化数组元素的值
for(int i=0; i<a.length; i++){
  a[i] = 100 * i;    
}

//读取元素的值
for(int i=0; i<a.length; i++){
  System.out.printlin(a[i]);
}

//for each循环，由于读取元素值，不能修改元素值
for(m ：a){
   System.out.printlin(m);
}

/**
 * 多维数组
 */
public class TestDemo {
    public static void main(String[] args) {
        int[][] a = {
                {1, 3},
                {2, 4}
        };

        int[][] b = {
                {3, 4},
                {5, 6}
        };

    int[][] c = new int[2][2];

    for(int i=0; i<c.length; i++){
        for (int j=0; j<c.length; j++){
            c[i][j] = a[i][j] + b[i][j];
        }
    }

        printMatrix(c);
    }

    public static void printMatrix (int[][] c ){
        for (int i=0; i<c.length; i++){
            for (int j=0; j<c.length; j++){
                System.out.print(c[i][j] + "\t");
            }
            System.out.println();
        }
    }
}