（异常的产生）把下面代码补充完整 public class TestThrow{ public static void main(String args[]){ throwException(10); } public static void throwException(int n){ if (n == 0){ //抛出一个 NullPointerException }else{ //抛出一个 ClassCastException //并设定详细信息为“类型转换出错” } } } （异常的产生）把下面代码补充完整 public class TestThrow{ public static void main(String args[]){ throwException(10); } public static void throwException(int n){ if (n == 0){ //抛出一个 NullPointerException }else{ //抛出一个 ClassCastException //并设定详细信息为“类型转换出错” } } }

public class TestThrow{
public static void main(String args[]){
try{
throwException(10);
} catch(NullPointerException e){
System.out.println("发生了NullPointerException异常");
} catch(ClassCastException e){
System.out.println("发生了ClassCastException异常：类型转换出错");
}
}

public static void throwException(int n){
if (n == 0){
throw new NullPointerException("空指针异常");
}else{
throw new ClassCastException("类型转换出错");
}
}
}