package com.wdxxl.InvocationTargetException;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * InvocationTargetException異常由Method.invoke(obj, args...)方法拋出食听。
 * 當(dāng)被調(diào)用的方法的內(nèi)部拋出了異常而沒有被捕獲時践剂，將由此異常接收。
 */
public class InvocationTargetExceptionTest {
    public static void main(String[] args) {
        Class<?> clazz;
        try {
            clazz = Class.forName("com.wdxxl.InvocationTargetException.Reflect");
            Method method = clazz.getMethod("runInt", int.class);
            method.invoke(clazz.newInstance(), 1);
        } catch (ClassNotFoundException | NoSuchMethodException | SecurityException | 
                 IllegalAccessException | IllegalArgumentException | InstantiationException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {

            System.out.println("此處接收被調(diào)用方法內(nèi)部未被捕獲的異常");  
            Throwable cause = e.getCause();
            if(cause instanceof OutOfMemoryError){
                throw (OutOfMemoryError)cause;
            }if(cause instanceof Error){
                throw new Error(cause);
            }else if(cause instanceof ZeroException){
                Throwable t = e.getTargetException();
                t.printStackTrace();
            }
        }
    }
}

package com.wdxxl.InvocationTargetException;

public class Reflect {
    public void runInt(int i) throws ZeroException {
        new B().runInt(i);
    }
}

class B {
    public void runInt(int i) throws ZeroException {
        if (i == 0) { throw new OutOfMemoryError("參數(shù)不能=零"); }
        if (i == 1) { throw new Error("參數(shù)不能=1"); }
        if (i < 0) { throw new ZeroException("參數(shù)不能小于零"); }
        System.out.println("參數(shù): " + i);
    }
}

class ZeroException extends Exception {
    private static final long serialVersionUID = 1L;
    private String message;
    public ZeroException(String message) {
        this.message = message;
    }
    public String getMessage() {
        return message;
    }
}