Java 安装方式与其变数型态

public class VariableTypes {
 
    public static void main (String[] args) {
        boolean bool = true;
        int num = 10;
        int nums[] = {-2,2,3,4};
        String str = "test";
        String strs[] = {"t1", "t2"};
 
        System.out.println("bool  = " + bool);
 
        System.out.println("num  = " + num);
        for (int i = 0; i< nums.length; i++) {
            System.out.println("nums  = " + nums[i]);
        }
        System.out.println("str  = " + str);
 
        for (int i = 0; i< strs.length; i++) {
            System.out.println("strs  = " + strs[i]);
        }
 
    }
 
}

int[][] pos = new int[][]{
    {-2,  -3,  3},
    {-5, -10,  1},
    {10,  30, -5},
};
 
//
int[][] pos2 = new int[3][3];
pos2[0] = {1,2,3};