package com.test;
public class LoopDemo2 {
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
for (int j = 0; j < i; j++) {
System.out.print("*");
}
System.out.println();
}
System.out.println();
System.out.println("****************分割符*************");
System.out.println();
for (int i = 10; i > 0; i--) {
for (int j = 0; j < i; j++) {
System.out.print("*");
}
System.out.println();
}
System.out.println();
System.out.println("****************分割符*************");
System.out.println();
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}
System.out.println();
System.out.println("****************分割符*************");
System.out.println();
// 平行四边形
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= (5 - i); j++) {
System.out.print(" ");
}
for (int k = 1; k <= 5; k++) {
System.out.print("*");
}
System.out.println();
}
System.out.println();
System.out.println("****************分割符*************");
System.out.println();
// 矩形
for (int j = 1; j <= 5; j++) {
for (int i = 1; i <= 5; i++) {
System.out.print("*");
}
System.out.println();
}
System.out.println();
System.out.println("****************分割符*************");
System.out.println();
// 等腰三角形
for (int i = 1; i <= 6; i++) {
for (int j = 1; j <= 6 - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= (2 * i) - 1; k++) {
System.out.print("*");
}
System.out.println();
}
System.out.println();
System.out.println("****************分割符*************");
System.out.println();
// 棱形
for (int i = 1; i <= 6; i++) {
for (int j = 1; j <= 6 - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= (2 * i) - 1; k++) {
System.out.print("*");
}
System.out.println();
}
for (int a = 1; a <= 5; a++) {
for (int b = 1; b <= a; b++) {
System.out.print(" ");
}
for (int c = 1; c <= 9 - 2 * (a - 1); c++) {
System.out.print("*");
}
System.out.println();
}
System.out.println();
System.out.println("****************分割符*************");
System.out.println();
// 倒三角形
for (int j = 4; j > 0; j--) {
for (int k = 1; k <= 5 - j; k++) {
System.out.print(" ");
}
for (int a = 1; a <= 2 * j - 1; a++) {
System.out.print("*");
}
System.out.println();
}
}
}
案例截图：
