Iterator&Map&List&LinkedHashMap&普通for循环&增强for循环&bean

博主老早就想总结一下，但是迫于没时间，感觉只是给自己找借口，但是现在花了一上午，终于整理好了，而且注释比较详细，废话不多说，现在上代码：

首先，博主自定义了一个bean类，为了测试自定义的那个list

这个bean里面博主把常用的类型基本都用了，但是不建议大家定义的时候使用float，真心很麻烦

另外就是get/set这一块，注意boolean类型是is和set，不是get，这个大家注意下

package cn.edu.sjzc.weiaccept.bean;/** * Created by fanyafeng on 2015/5/8/0008. */public class FanyafengBean implements Comparable{    private int Age;    private long Height;    private float Phone;    private double hair;    private String Name;    private boolean Sex;    public FanyafengBean(int age, long height, float phone, double hair, String name, boolean sex) {        Age = age;        Height = height;        Phone = phone;        this.hair = hair;        Name = name;        Sex = sex;    }    public int getAge() {        return Age;    }    public void setAge(int age) {        Age = age;    }    public long getHeight() {        return Height;    }    public void setHeight(long height) {        Height = height;    }    public float getPhone() {        return Phone;    }    public void setPhone(float phone) {        Phone = phone;    }    public double getHair() {        return hair;    }    public void setHair(double hair) {        this.hair = hair;    }    public String getName() {        return Name;    }    public void setName(String name) {        Name = name;    }    public boolean isSex() {        return Sex;    }    public void setSex(boolean sex) {        Sex = sex;    }    @Override    public String toString() {        return "FanyafengBean{" +                "Age=" + Age +                ", Height=" + Height +                ", Phone=" + Phone +                ", hair=" + hair +                ", Name='" + Name + '\'' +                ", Sex=" + Sex +                '}';    }    @Override    public int compareTo(Object another) {        return 0;    }}

这是博主定义的bean类，因为涉及到顺序，所以要实现一个java.lang中的comparable，详情请看

http://blog.csdn.net/qq_23195583/article/details/44174181

再有就是具体的方法的书写了：

来看第一个：

简单的int，string

private static void intOrString() {        /**         * 简单罗列了一下一维数组的遍历         * int,String,         * 一个是普通的for循环，一个是增强的for循环         */        int int_array[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0};        for (int arrayItem : int_array) {            System.out.print(arrayItem + ",");        }        System.out.println();        System.out.println("-------------------------------------------------------------------");        for (int i = 0; i < int_array.length; i++) {            System.out.print(int_array[i] + ",");        }        System.out.println();        System.out.println("-------------------------------------------------------------------");        String string_array[] = {"樊亚风", "软件工程", "java", "Android", "IOS"};        for (String arrayItem : string_array) {            System.out.print(arrayItem + ",");        }        System.out.println();        System.out.println("-------------------------------------------------------------------");        for (int i = 0; i < string_array.length; i++) {            System.out.print(string_array[i] + ",");        }        System.out.println();        System.out.println("-------------------------------------------------------------------");    }

第二个：

这里面包含的比较多

注释里面都有

private static void growing() {        /**         * 自定义一个类，里面包含了常用的类型         */        int Age = 0;        long Height = 180;        float Phone = 15530128888f;        double hair = 3000d;        String Name = "樊亚风";        boolean Sex = true;        String sex;        List<Map<String, Object>> fanyafengList = new ArrayList<Map<String, Object>>();        List<FanyafengBean> fanyafengBeans = new ArrayList<FanyafengBean>();        FanyafengBean[] fanyafengBeanArray = new FanyafengBean[]{                new FanyafengBean(Age, Height, 18032278888f, 3000d, Name, Sex),                new FanyafengBean(22, 180, 18032278888f, hair, "樊亚风", true),                new FanyafengBean(23, Height, 15530124556f, 3000d, Name, Sex),                new FanyafengBean(24, 180, Phone, 2000d, "樊亚风", true)        };        /**         * 增强的for循环         */        for (FanyafengBean fanyafengBeanItem : fanyafengBeanArray) {            System.out.print(fanyafengBeanItem.getAge() + ",");            System.out.print(fanyafengBeanItem.getHeight() + ",");            System.out.print(fanyafengBeanItem.getPhone() + ",");            System.out.print(fanyafengBeanItem.getHair() + ",");            System.out.print(fanyafengBeanItem.getName() + ",");            if (fanyafengBeanItem.isSex()) {                sex = "男";            } else {                sex = "女";            }            System.out.print(sex);            System.out.println();        }        System.out.println("-------------------------------------------------------------------");        /**         * 普通的for循环遍历         * 以及一些list，map         * 还有自定义类的数组         */        for (int i = 0; i < 4; i++) {            FanyafengBean fanyafengBean = new FanyafengBean(Age, Height, Phone, hair, Name, Sex);            Map<String, Object> map = new HashMap<String, Object>();            map.put("myage", fanyafengBeanArray[i].getAge());            System.out.print(fanyafengBeanArray[i].getAge() + ",");            map.put("myheight", fanyafengBeanArray[i].getHeight());            System.out.print(fanyafengBeanArray[i].getHeight() + ",");            map.put("myphone", fanyafengBeanArray[i].getPhone());            System.out.print(fanyafengBeanArray[i].getPhone() + ",");            map.put("myhair", fanyafengBeanArray[i].getHair());            System.out.print(fanyafengBeanArray[i].getHair() + ",");            map.put("myname", fanyafengBeanArray[i].getName());            System.out.print(fanyafengBeanArray[i].getName() + ",");            map.put("mysex", fanyafengBeanArray[i].isSex());            if (fanyafengBeanArray[i].isSex()) {                sex = "男";            } else {                sex = "女";            }            System.out.print(sex);            System.out.println();            fanyafengList.add(map);        }        Arrays.sort(fanyafengBeanArray);        fanyafengBeans = Arrays.asList(fanyafengBeanArray);        System.out.println(fanyafengBeans.toString());        System.out.println("-------------------------------------------------------------------");    }

第三个

二维数组

 private static void doubleArray() {        /**         * 二位数组         */        int darray[][] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {0}};        for (int i = 0; i < darray.length; i++) {            for (int j = 0; j < darray[i].length; j++) {                System.out.print(darray[i][j]);            }            System.out.println();        }        System.out.println("-------------------------------------------------------------------");        for (int da[] : darray) {            for (int daItem : da) {                System.out.print(daItem);            }            System.out.println();        }        System.out.println("-------------------------------------------------------------------");    }

第四个：

这里面是list数组，涉及到了迭代器使用，遍历

    private static void list() {/** * list数组 * 迭代器，增强for循环 */        List<String> list = new ArrayList<>();        list.add("樊亚风");        list.add("正在学习");        list.add("IOS");        Iterator<String> iterator = list.iterator();        while (iterator.hasNext()) {            String strList = (String) iterator.next();            System.out.println(strList);        }        System.out.println("\n" + "-------------------------------------------------------------------");        for (String item : list) {            System.out.print(item);        }        System.out.println();        System.out.println("-------------------------------------------------------------------");        for (int i = 0; i < list.size(); i++) {            System.out.print(list.get(i));        }        System.out.println();        System.out.println("-------------------------------------------------------------------");    }

第五个

说一下网络层编写常用的

详情看注释

private static void linkmap() {        /**         * 这里强调必须要初始化，否则程序过不去         * 但是在些项目的时候我很少初始化         * 的确都是先定义         */        String name = "fanyafeng";        String major = "software";        String url = "detail";        StringBuffer myurl = new StringBuffer(url);        StringBuffer myurl1 = new StringBuffer(url);        myurl.append(":");        Map<String, String> map = new LinkedHashMap<String, String>();        map.put("name", name);        map.put("major", major);        for (Map.Entry<String, String> entry : map.entrySet()) {            myurl.append(entry.getKey()).append("=");            myurl.append(entry.getValue());            //网络获取切记用linkedhashmap，否则容易出问题//            myurl.append(URLEncoder.encode(entry.getValue(), "UTF-8"));            myurl.append("&");        }        myurl.deleteCharAt(myurl.length() - 1);        System.out.print(myurl.toString());        System.out.println("\n" + "--------------------------------------------");        Map<String, String> map1 = new HashMap<String, String>();        map1.put("name", name);        map1.put("major", major);        for (Map.Entry<String, String> entry : map1.entrySet()) {            myurl1.append(entry.getKey()).append("=");            myurl1.append(entry.getValue());            myurl1.append("&");        }        myurl.deleteCharAt(myurl.length() - 1);        System.out.print(myurl.toString());        System.out.println("\n" + "--------------------------------------------");    }

第六个

迭代器和map的使用

 private static void it() {        /**         * 迭代器         */        Map map = new HashMap();        for (int i = 0; i < 10; i++) {            map.put(i, new String("map" + i));        }        Iterator iterator=map.entrySet().iterator();        while (iterator.hasNext()){            Map.Entry strMap=(Map.Entry)iterator.next();            System.out.print(strMap.getValue()+",");        }        System.out.println("\n"+"----------------------------------");    }

第七个就是主方法，以及需要引入的类

import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import java.util.ArrayList;import java.util.Arrays;import java.util.HashMap;import java.util.Iterator;import java.util.LinkedHashMap;import java.util.LinkedList;import java.util.List;import java.util.Map;/** * Created by fanyafeng on 2015/5/8/0008. */public class TestClass {    public static void main(String[] args) {        System.out.println("测试主程序");        System.out.println("-------------------------------------------------------------------");        intOrString();        growing();        doubleArray();        list();        linkmap();        it();    }

最后是程序截图