for(int j=0j<5-i-1j++){
System.out.print(" ")
}
for (int K = 0K <2*i+1K++) {
System.out.print("*")
}
System.out.println()
}
输出结果就是三角形
以下是实心、空心、倒立，三种等边三角形的代码：实心等边三角形：
public static void main(String[] args) {
int n = 5
String c = "0"
String x = "*"
for (int i = 0i <ni++) {
for (int k = 0k <n - i - 1k++) {
System.out.print(c)
}
for (int k = 0k <i + 1k++) {
System.out.print(x)
}
for (int k = 0k <ik++) {
System.out.print(x)
}
/**
* 一下注释掉的代码属于多余的代码，本程序只需要分成三块实现
*/
// for (int k = 0k <n - i - 1k++) {
// System.out.print(c)
// }
System.out.println()
}
}
空心等边三角形：
public static void main(String[] args) {
int n = 6
String c = " "
String x = "*"
for (int i = 0i <ni++) {
for (int j = 0j <2 * nj++) {
if (j == (n - i) || j == (n + i)) {
System.out.print(x)
} else {
System.out.print(c)
}
}
System.out.println()
}
for(int j=0j<2*(n+1)-1j++){
System.out.print(x)
}
}
倒等边三角形：
public static void main(String[] args) {
int n = 5
String c = " "
String x = "*"
for(int j=0j<2*(n+1)-1j++){
System.out.print(x)
}
System.out.println()
for (int i = 0i <ni++) {
for (int j = 0j <2 * nj++) {
if (j == i+1 || j == (2*n - i-1)) {
System.out.print(x)
} else {
System.out.print(c)
}
}
System.out.println()
}
}
//java编程：输入三角形的三边，并输出，同时判断这三边能否构成三角形，public class Triangle2
{
private double sideA,sideB,sideC//外部不能改变这些变量的值，只能在类中使用方法来修改和获得这些变量的值
public void setSide(double sideA,double sideB,double sideC)
{
this.sideA=sideA//成员变量被局部变量隐藏，需要使用this关键字使用被隐藏的成员变量
this.sideB=sideB
this.sideC=sideC
}
public double getSideA()
{
return sideA
}
public double getSideB()
{
return sideB
}
public double getSideC()
{
return sideC
}
public boolean isOrNotTrangle()//判断三边能否构成三角形
{
if(sideA+sideB>sideC&&sideA+sideC>sideB&&sideB+sideC>sideA)
{
return true
}
else
{
return false
}
}
}
class Example1
{
public static void main(String args[])
{
double sideA,sideB,sideC
Triangle2 triangle=new Triangle2()
triangle.setSide(7.2,8.3,9.6)
sideA=triangle.getSideA()
sideB=triangle.getSideB()
sideC=triangle.getSideC()
System.out.println("输入的三角形的三边为："+sideA+" "+sideB+" "+sideC)
boolean isOrNotTrangle=triangle.isOrNotTrangle()
if(isOrNotTrangle==true)
{
System.out.println("这三边可以构成三角形")
}
else
{
System.out.println("这三边不可以构成三角形")
}
}
}
