JAVA反射学习（2）

 

package com.langsin.reflection;

import java.lang.reflect.Method;

public class InvokeTest {

	public int add(int a,int b){
		return a+b;
	}
	
	public String eoch(String s){
		return "eoch "+s;
	}
	
	public static void main(String[] args) throws Exception{
		Class<?> classType = InvokeTest.class;
		Object object = classType.newInstance();
		Method addMethod = classType.getMethod("add", new Class[]{int.class,int.class});
		Object result = addMethod.invoke(object, new Object[]{new Integer(100),new Integer(223)});
		System.out.println(result.toString());
		
		Method eochMethod = classType.getMethod("eoch", new Class[]{String.class});
		Object result2 = eochMethod.invoke(object, new Object[]{"sdf"});
		System.out.println(result2.toString());
	}

}

 

 

 

package com.langsin.reflection;

import java.lang.reflect.Array;

//一维数组
public class ArrayTest1 {

	public static void main(String[] args) throws Exception {
		Class<?> stringArray = Class.forName("java.lang.String");
		Object array = Array.newInstance(stringArray, 10);
		Array.set(array, 5, "hello");
		Object value = Array.get(array, 5);
		System.out.println(value.toString());
	}

}

 

 

 

package com.langsin.reflection;

import java.lang.reflect.Array;
/**
 * 三维数据，在[3][5][8]位置设置值97
 */
public class ArrayTest2 {

	public static void main(String[] args) {
		int[] dim = { 5, 7, 10 };
		Object array = Array.newInstance(Integer.TYPE, dim);
		//得到一个二维数组
		Object object1 = Array.get(array, 3);
		System.out.println(object1.getClass().getComponentType());
		//得到一个一维数组
		Object object2 = Array.get(object1, 5);
		System.out.println(object2.getClass().getComponentType());
		Array.setInt(object2, 8, 97);
		int[][][] arrayCast = (int[][][]) array;
		System.out.println(arrayCast[3][5][8]);
	}

}