Map的遍历方法及String和其它类型的相互转化

• Map的遍历方法：

package com.lky.test;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Map.Entry;

import org.junit.Test;

public class mapTest {

    public static String []keys=new String[]{"name","sex","email","phone"};

    public static String []values=new String[]{"lky","male","[email protected]","016515151"};

    public static Map<String,String> info=new HashMap<String,String>();

    static{

          for(int i=0;i<values.length;++i){

              info.put(keys[i], values[i]);

          }

    }

    @Test

    public void testMap(){

        for(Entry<String, String> entry:info.entrySet()){

            System.out.println(entry.getKey()+"---"+entry.getValue());

        }

        System.out.println("---------------");

    }

    @Test

    public void testMap1(){

        for(String key:info.keySet()){

            System.out.println(key+"--------"+info.get(key));

        }

        System.out.println("---------------");

    }

    @Test

    public void testMap2(){

        Iterator<Entry<String, String>> iterator=info.entrySet().iterator();

        while(iterator.hasNext()){

            Entry<String, String> s=iterator.next();

            System.out.println(s.getKey()+"----------"+s.getValue());

        }

    }

}

• String和其它数据类型的相互转化

package com.lky.test;

import java.io.UnsupportedEncodingException;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

import org.junit.Test;

public class stringToElse {

    //字符串和byte数组之间的转化

    @Test

    public void test() throws UnsupportedEncodingException{

        String s="lky";

        byte[] info=s.getBytes();

        String s1=new String(info,"utf-8");

        System.out.println(s1);

    }

    //字符串和Date之间的转化

    @Test

    public void test1() throws ParseException{

        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

        Date date=  sdf.parse("2015-10-14");//将字符串转化成Date类型

        System.out.println(date);

        System.out.println(sdf.format(date));//将日期类型转化成字符串类型

    }

    //字符串和int之间的转化

    @Test

    public void test2(){

        String s="1000";

        int integer=Integer.parseInt(s);

        System.out.println(integer);

        System.out.println(Integer.valueOf(integer).toString());

    }

}