public class Triangle { int a,b,c; public Triangle(int a, int b, int c) { this.a = a; this.b = b; this.c = c; } public boolean isTriangle(){ boolean result=true; if((a+b)>c&&(a+c)>b&&(b+c)>a){ result=true; } else{ result=false; } return result; } public int perimeter(){ return a+b+c; } public void isIsosceles (){ if(a==b&&a==c){ System.out.println("等边三角形"); }else{ if(a==b||a==c||b==c){ System.out.println("等腰三角形"); } } } }