package ch4;/** * Created by Jiqing on 2016/11/9. */public class ArrayInRam {    public static void main(String[] args) {        int[] a = {5,7,20};        int[] b = new int[4];        System.out.println("b数组的长度为："+b.length);        for(int i = 0,len = a.length;i

package ch4;/** * Created by Jiqing on 2016/11/9. */public class Person {    public int age; // 年龄    public double height; // 身高    public void info() {        System.out.println("我的年龄是："+age+",我的身高是："+height);    }}

package ch4;/** * Created by Jiqing on 2016/11/9. */public class Student {    public static void main(String[] args) {        Person[] students;        students = new Person[2];        Person zhang = new Person();        zhang.age = 15;        zhang.height = 158;        Person lee = new Person();        lee.age = 16;        lee.height = 161;        students[0] = zhang;        students[1] = lee;        lee.info(); // 我的年龄是：16,我的身高是：161.0        students[1].info(); // 我的年龄是：16,我的身高是：161.0    }}