实验九:异常的抛出,捕获并处理

时间:2021-03-19 18:26:47
 
 
package 实验九;

import java.util.Scanner;

public class Triangle {
@SuppressWarnings("unused")
private static final Point Point = null;
public Point point2,point3;
protected double a,b,c;
public Triangle(Point p1,Point p2,Point p3) {
//super("三角形",p1);
this.point2=p2;
this.point3=p3;

}
public Triangle() {
}
@SuppressWarnings("serial")
public static void main(String[] args) {

try {
@SuppressWarnings("resource")
Scanner shuru=new Scanner(System.in);

System.out.println("请输入一个点:");
int h=shuru.nextInt();
int a=shuru.nextInt();
Point p1 = new Point(h,a);

System.out.println("请输入一个点:");
int h1=shuru.nextInt();
int a1=shuru.nextInt();
Point p2 = new Point(h1,a1);

System.out.println("请输入一个点:");
int h2=shuru.nextInt();
int a2=shuru.nextInt();
Point p3 = new Point(h2,a2);
@SuppressWarnings("unused")
Triangle s = new Triangle(p1, p2, p3);
double g=(h1-h)/(a1-a);
double p=(h2-h1)/(a2-a1);
if(g!=p) {
System.out.println("这三个点可以构成一个三角形");
}
else{
throw new Exception() {
public String toString() {
return "无效参数";
}
};
}
}
catch(Exception e){
System.out.println(e.toString());
}
finally {
System.out.println("程序结束");

}
}

}



实验心得:通过本次实验我学习到了异常的抛出,捕获,并处理。程序通过try{}捕捉异常,try如果有异常发生,程序的运行便会中断,抛出“异常类所产生的对象”。try{}抛出的异常对象会进入catch()判断是否是括号内想要捕获的异常,如果是,就会进入catch{}代码块内进行异常的处理,程序继续往下运行,可以有多个catch(){},即可以有多个异常对象,按类处理异常。finally{}程序无论是否捕获异常都会执行,一般用来关闭对象。