if(age < 0){
throw new MyException("年龄不能为负数！");
}

package Test;
 
 public class Test2 {
   public static void main(String[] args) {
     String s = "abc"; 
     if(s.equals("abc")) { 
       throw new NumberFormatException();
     } else { 
       System.out.println(s); 
     } 
   }
 
 }

ppublic class Shoot {  创建类
 
static void pop() throws NegativeArraySizeException {
 
//定义方法并抛出NegativeArraySizeException异常
 
int [] arr = new int[-3];//创建数组
}
 
public static void main(String[] args) {//主方法
try { 
 
pop(); //调用pop()方法
 
} catch (NegativeArraySizeException e) {
 
System.out.println("pop()方法抛出的异常");//输出异常信息
}
}
}