1 添加一个类 my / Triangle.java
package my;
public class Triangle
{
public int a ;
public int b ;
public int c ;
// 求周长
public int perimeter()
{
return this.a + this.b + this.c;
}
}
2 使用
package my;
public class HelloWorld
{
public static void main(String[] args)
{
Triangle t = new Triangle();
t.a = 3 ;
t.b = 4 ;
t.c = 5;
int p = t.perimeter();
System.out.println("周长为: " + p);
}