Java打印三角形

package classicExecise;

/**
 * @author Ahan
 * @version 1.0
 * @Date 2021/11/18
 * @description 打印三角形
 **/
public class PrintTriangle {
    public static void main(String[] args) {
        // triangle4();
    }

    /**
     * 直角三角形
     */
    public static void triangle1() {
        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }

    /**
     * 倒三角形
     */
    public static void triangle2() {
        for (int i = 0; i <= 5; i++) {
            for (int j = 5; j >= i; j--) {
                System.out.print("* ");
            }
            System.out.println();
        }
    }

    /**
     * 13579三角形
     */
    public static void triangle3() {
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j < 5 - i; j++) {
                System.out.print("");
            }
            for (int k = 1; k <= (2 * i) - 1; k++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }

    /**
     * 等腰三角形
     */
    public static void triangle4() {
        for (int i = 1; i <= 5; i++) {
            for (int j = 5-i; j >0; j--) {
                System.out.print(" ");
            }
            for (int j =1;j<=i;j++){
                System.out.print("* ");
            }
            System.out.println();
        }
    }
}