An introduction to using the throw keyword to throw exceptions in Java programming

throw throws an exception in a more direct way:

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

Let’s look at an example:

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);
     }
   }
  
 }

The running results are as follows:

In Java, you can declare an exception when a method is defined, and then you can use throw to specifically throw an exception during implementation.

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
}
}
}

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