自定义异常类,非法年龄类,并在person3类中使用此类,根据情况抛出异常,并进行处理。
package naizi;
class IllegalAgeException extends Exception{ //无效年龄异常类
public IllegalAgeException(String s){
super(s);
}
public IllegalAgeException(){
this("");
}
}
public class Person3{
protected String name; //姓名
protected int age; //年龄
public Person3(String name,int age)throws IllegalAgeException{ //抛出异常的方法,请准确写出抛出的异常类
this.set(name);
this.set(age);
}
public void set(String name){
if (name==null || name=="")
this.name = "姓名未知";
else
this.name = name;
}
public void set(int age) throws IllegalAgeException { //抛出异常的方法,请准确写出抛出的异常类
if (age>=0 && age<100)
this.age = age;
else
throw new IllegalAgeException(Integer.toString(age)); //抛出IllegalAgeException的类
}
public void set(String name, int age) throws IllegalAgeException { //抛出异常的方法,请准确写出抛出的异常类
this.set(name);
this.set(age);
}
public String toString() {
return this.name+","+this.age+"岁";
}
public void print(){
System.out.println(this.toString());
}
public static void main(String args[]){
Person3 p1=null;
try{ //写出异常处理结构语句
p1 = new Person3("李小明",20); //调用声明抛出异常的方法,必须写在try语句中,否则编译不通过
p1.set(121);
}catch (IllegalAgeException e){ //捕获自定义异常类,而非Exception类
e.printStackTrace(); //显示异常栈跟踪信息
}finally {
p1.print();
}
}
}
运行结果如图: