java 打印图形

打印菱形

package study.stage2;

/**
 * Created by Sandy.Liu on 2017/7/27.
 */
public class Diamond {
    public static void main(String[] args){
        print(8);
    }

    public static void print(int size){
        if(size%2==0){
            size++;
        }

        for(int i=0;i<size/2+1;i++){
            for(int j=size/2+1;j>i+1;j--){
                System.out.print(" ");
            }

            for(int j=0;j<2*i+1;j++){
                System.out.print("*");
            }
            System.out.println();
        }
        for(int i=size/2+1;i<size;i++){
            for(int j=0;j<i-size/2;j++){
                System.out.print(" ");
            }
            for(int j=0;j<2*(size-i)-1;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

打印乘法表

package study.stage2;

/**
 * Created by Sandy.Liu on 2017/7/27.
 */
public class MotiplicationTab {
    public static void main(String[] args){
        int count = 1;
        for(int i=0;i<9;i++){
            for(int j=1;j<=count;j++){
                System.out.print(j+" x "+count+" = "+j*count+"  ");
            }
            count++;
            System.out.println();
        }
    }
}

运行结果

1 x 4 = 4 2 x 4 = 8 3 x 4 = 12 4 x 4 = 16
1 x 5 = 5 2 x 5 = 10 3 x 5 = 15 4 x 5 = 20 5 x 5 = 25
1 x 6 = 6 2 x 6 = 12 3 x 6 = 18 4 x 6 = 24 5 x 6 = 30 6 x 6 = 36
1 x 7 = 7 2 x 7 = 14 3 x 7 = 21 4 x 7 = 28 5 x 7 = 35 6 x 7 = 42 7 x 7 = 49
1 x 8 = 8 2 x 8 = 16 3 x 8 = 24 4 x 8 = 32 5 x 8 = 40 6 x 8 = 48 7 x 8 = 56 8 x 8 = 64
1 x 9 = 9 2 x 9 = 18 3 x 9 = 27 4 x 9 = 36 5 x 9 = 45 6 x 9 = 54 7 x 9 = 63 8 x 9 = 72 9 x 9 = 81

public class PrintQuadrangle {
    public static void main(String[] args){
        int n=5;
        //打印平行四边形
        for(int i=0;i<n;i++){
            for (int j=0;j<i;j++){
                System.out.print(" ");
            }
            for(int j=0;j<n;j++){
                System.out.print("*");
            }
            System.out.println();
        }

        //打印矩形
        System.out.println();
        for(int i=0;i<n;i++){
            for(int j=0;j<n;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }

}