package com.smbea.demo.reflect;

/**

 * 越界异常

 * @author hapday

 * @date 2017年1月20日 @time下午7:59:01

 */

public class OverstepBoundaryException extends Exception {

	/**

	 *

	 */

	private static final long serialVersionUID = 1L;

	private String message;

	public String getMessage() {

		return message;

	}

	public OverstepBoundaryException(String message) {

		this.message = message;

	}

}

package com.smbea.demo.reflect;

public class B {

	public void say(int cursor) throws OverstepBoundaryException{

		double number [] = new double[5];

		for(int index = 0; index < 5; index++) {

			number[index] = Math.random();

		}

		if(0 > cursor) {

			throw new OverstepBoundaryException("数组索引不可以小于 0！");

		}

		if(4 < cursor) {

			throw new OverstepBoundaryException("数组索引不可以大于 5！");

		}

		System.out.println("cursor = " + cursor + ", number[" + cursor + "] = " + number[cursor]);

	}

}

package com.smbea.demo.reflect;

/**

 * 当被调用的方法内部出现了异常，而未被捕获时，将由 InvocationTargetException 异常来接收

 * @author hapday

 * @date 2017年1月20日 @time下午8:21:04

 */

public class A {

	public void print(int length) throws OverstepBoundaryException {

		B b = new B();

		b.say(length);

	}

}

package com.smbea.demo.reflect;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

/**

 * InvocationTargetException 异常的抛出通常是一个方法调用另一个方法时，都未捕获方法中的异常

 * @author hapday

 * @date 2017年1月20日 @time下午8:16:50

 */

public class Test {

	public static void main(String[] args) {

		try {

			Class<?> clazz = Class.forName("com.smbea.demo.reflect.A");

			try {

				Method method = clazz.getMethod("print", int.class);

				try {

					method.invoke(clazz.newInstance(), 5);

				} catch (IllegalAccessException e) {

					e.printStackTrace();

				} catch (IllegalArgumentException e) {

					e.printStackTrace();

				} catch (InvocationTargetException e) {

					System.out.println("此处接收了方法内部未被捕获的异常。");

					e.printStackTrace();

				} catch (InstantiationException e) {

					e.printStackTrace();

				}

			} catch (NoSuchMethodException e) {

				e.printStackTrace();

			} catch (SecurityException e) {

				e.printStackTrace();

			}

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		}

	}

}

package com.smbea.demo.reflect;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

/**

 * InvocationTargetException 异常的抛出通常是一个方法调用另一个方法时，都未捕获方法中的异常

 * @author hapday

 * @date 2017年1月20日 @time下午8:16:50

 */

public class Test2 {

	public static void main(String[] args) {

		try {

			Class<?> clazz = Class.forName("com.smbea.demo.reflect.A");

			try {

				Method method = clazz.getMethod("print", int.class);

				try {

					method.invoke(clazz.newInstance(), -1);

				} catch (IllegalAccessException e) {

					e.printStackTrace();

				} catch (IllegalArgumentException e) {

					e.printStackTrace();

				} catch (InvocationTargetException e) {

					System.out.println("此处接收了方法内部未被捕获的异常。");

					Throwable throwable = e.getTargetException();

					throwable.printStackTrace();

				} catch (InstantiationException e) {

					e.printStackTrace();

				}

			} catch (NoSuchMethodException e) {

				e.printStackTrace();

			} catch (SecurityException e) {

				e.printStackTrace();

			}

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		}

	}

}