weixin_46592884的博客

class number {int a, b;number(int a,int b){this.a=a;this.b=b;}public int sum() { //加法int s1=a+b;return s1;}void display_01() { //方法1调用sum() 方法System.out.println(“和为”+this.sum()); }public int sub() { //减法int s2=a-b;return s2;}void d

package pcj.com;class Tangle { int a, b, c; Tangle(int a, int b, int c) { this.a=a; this.b=b; this.c=c; } public double triangleArea(){ float p=(a+b+c)/2f; float s1=(float)Math.sqrt(p*(p-a)*(p-b)*(p