创建一个手机类，可以通过手机获得指定联系人的电话号码

Mobile.java

package com.mobile;

public class Mobile {
	private String[] names = new String[10];//定义数组，开辟内存空间
	private String[] nums = new String[10];//定义数组，开辟内存空间
	java.util.Scanner input = new java.util.Scanner(System.in);
	//开始方法
	public void star(){
		
		System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
		System.out.println("请选择：");
		System.out.println("1.存入电话号码");
		System.out.println("2.查询电话号码");
		System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
				
		String num = input.next();
		if ("1".equals(num)){
			save();
		}else if ("2".equals(num)){
			search();
		} else {
			System.out.println("输入错误，请重新选择！");
			
		}
		star();
	}
	//存储方法
	public void save(){
		System.out.println("请输入姓名：");
		String name = input.next();
		
		System.out.println("请输入电话号码：");
		String telNum = input.next();
		
		int index = -1;//引进临时变量，来判断内存使用情况
		for (int i = 0; i < names.length; i++){
			if (names[i] == null){
				names[i] = name;
				nums[i] = telNum;
				index = i;
				break;
			}
		}
		if (index == -1){
			System.out.println("内存已满！");
		}
		star();
	}
	//查询方法
	public void search(){
		System.out.println("请输入要查询的姓名");
		String name = input.next();
		
		int index = -1;//引进临时变量，来判断内存使用情况
		for (int i = 0; i < names.length; i++){
			if (names[i] != null&&names[i].equals(name)){
				index = i;
				break;
			}
		}
		if (index != -1){
			System.out.println("你要查询的电话号码为：" + nums[index]);
		}else {
			System.out.println("要查询的电话号码不存在");
		}
		star();
	}

	
}

Test.java

package com.mobile;

public class Test {
	public static void main(String[] args) {
		Mobile m = new Mobile();
		m.star();
	}

}