Throws和Throw的区别

• throw 声明当前代码块中可能存在的异常信息，并且将当前异常信息抛给调用者
• throw会导致当前程序中断，后续代码不会执行
• throws在方法发头对外抛出某个异常，交由调用者解决异常
• main方法中对外抛出的异常由jvm处理
• throws可抛出多个异常，用“,”分隔
• 一般会将throws和throw在一起使用

import java.io.FileNotFoundException;
public class Test {
	public static void main(String[] args) {
		Student stu1 = new Student();
		stu1.setName("张三");
		try{
			stu1.setAge(-1);
			}catch (FileNotFoundException e) {
				e.printStackTrace();
			}
		System.out.println(stu1);
	}
}	
class Student {
	private String name;
	private int age;
	
	public Student() {
		super();
		// TODO Auto-generated constructor stub
	}
	@Override
	public String toString() {
		return "Student [name=" + name + ", age=" + age + "]";
	}
	public Student(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	//RuntimeException 当前方法会对外抛出异常，如果参数有误
	public void setAge(int age) throws FileNotFoundException{
		if(age<0||age>150)
			throw new FileNotFoundException();//异常中断
		this.age = age;
	}
}

结果：
java.io.FileNotFoundException
	at com.guxin.Throws.Student.setAge(Test.java:45)
	at com.guxin.Throws.Test.main(Test.java:9)
Student [name=张三, age=0]