初识Java好滋味，先来二两干货垫垫肚子~~~

public class Test002_Triangle {
public static void main(String[] args) {
printNormalTriangle(5);
printNormalTriangle_toPour(5);
printRightTriangle(5);
printRightTriangle_toPour(5);

}

//打印正的正三角形
public static void printNormalTriangle(int n){
for (int i = 0; i < n; i++) {
for (int j = i; j < n; j++) {
System.out.print(" ");
}
for (int k = 0; k < 2 * i + 1; k++) {
System.out.print("*");//注意：如果每行的*数等于行数，则需要加一个空格，否则无法完成对齐
}
System.out.println();
}
}

//打印倒的正三角形
public static void printNormalTriangle_toPour(int n){
for (int i = 0; i < n; i++) {
for (int j = 0; j < i; j++) {
System.out.print(" ");
}
for (int k = 0; k < 2*(n - i) - 1; k++) {
System.out.print("*");
}
System.out.println();
}
}

//打印正的直角三角形
public static void printRightTriangle(int n){
for (int i = 0; i < n; i++) {
for (int j = 0; j <= i; j++) {
System.out.print("*");
}
System.out.println();
}
}

//打印倒的直角三角形
public static void printRightTriangle_toPour(int n){
for (int i = 0; i < n; i++) {
for (int j = i; j < n; j++) {
System.out.print("*");
}
System.out.println();
}
}

}