JAVA_数组

package com.kk.array;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;


public class ArrayTest {

    public static void main(String[] args) throws Exception{
        dynamicGetInstance("com.kk.array.P");
    }
    
    /*
     * 数组拷贝
     */
    static void arrayCopy(){
        int []num1={1,2,3};
        int []num2=new int[3];
        System.arraycopy(num1, 0, num2, 0, 3);
        for (int i = 0; i < num2.length; i++) {
            System.out.println(num2[i]);
        }
    }
    
    /*
     * 获取Class
     */
    static void getClassName() throws ClassNotFoundException{
        P p=new P(1,2);
        Class c1=p.getClass();
        System.out.println(c1.getName());
        Class c2=Class.forName("com.kk.array.P");
        System.out.println(c2.getName());
        Class c3=P.class;
        System.out.println(c3.getName());
        Class c4=int.class;
        System.out.println(c4.getName());
        Class c5=Integer.TYPE;
        System.out.println(c5.getName());
    }
    
    /*
     * 通过反射调用类的方法
     */
    static void dynamicGetInstance(String className) throws Exception{
        P c=(P) Class.forName(className).newInstance();
        //Method [] method=c.getClass().getMethods();得到类中所有方法,包括private修饰的
        Constructor[] structs=c.getClass().getDeclaredConstructors();//得到公共的方法
        Constructor struct=structs[1];
        Class[] types=struct.getParameterTypes();
        Object[] paramValues=new Object[types.length];
        for (int i = 0; i < types.length; i++) {
            paramValues[i]=i+1;
        }
        Object o=struct.newInstance(paramValues);
        Method[] methods=c.getClass().getDeclaredMethods();
        for(Method method:methods){
                Long result=(Long) method.invoke(o, null);
                System.out.println("结果:"+result);
        }
    }
}
class P{
    private int x,y;

    public P() {
        super();
    }

    public P(int x, int y) {
        this.x = x;
        this.y = y;
    }
    
    public long add(){
        return x+y;
    }
}