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package com.zlh;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
public class TravelseDemo {
public static void main(String[] args) {
// 数组遍历
System.out.println("1 数组遍历");
String[] str1 = { "数", "组", "遍", "历" };
arrayTravelse(str1);
System.out.println("===================");
// 字符串遍历
System.out.println("2 字符串遍历");
String str2 = "字符串遍历";
stringTravelse(str2);
System.out.println("===================");
// list遍历
ArrayList list = new ArrayList();
list.add("集");
list.add("合");
list.add("遍");
list.add("历");
// list遍历-for-each
System.out.println("3 list遍历-for-each");
forTravelse(list);
System.out.println("===================");
// list遍历-迭代器
System.out.println("4 list遍历-迭代器");
iteratorTravelse(list);
System.out.println("===================");
// map遍历
Map map = new HashMap();
map.put("jack", 1);
map.put("tom", 2);
map.put("jerry", 3);
// map遍历-for-each与keySet
System.out.println("5 map遍历-for-each与keySet");
forKeySetTravelse(map);
System.out.println("===================");
// map遍历-迭代器与keySet
System.out.println("6 map遍历-迭代器与keySet");
iteratorKeySetTravelse(map);
System.out.println("===================");
// map遍历-for-each与entry
System.out.println("7 map遍历-for-each与entry");
forEntryTravelse(map);
System.out.println("===================");
// map遍历-迭代器与entry
System.out.println("8 map遍历-迭代器与entry");
iteratorEntryTravelse(map);
}
// 数组遍历
private static void arrayTravelse(String[] str) {
for (int i = 0; i < str.length; i++) {
String j = str[i];
System.out.print(j + " ");
}
System.out.println();
}
// 字符串遍历
private static void stringTravelse(String str) {
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
System.out.print(c + " ");
}
System.out.println();
}
// for-each循环遍历
private static void forTravelse(ArrayList list) {
for (String str : list) {
System.out.print(str + " ");
}
System.out.println();
}
// 迭代器遍历
private static void iteratorTravelse(ArrayList list) {
Iterator it = list.iterator();
while (it.hasNext()) {
String next = it.next();
System.out.print(next + " ");
}
System.out.println();
}
// map遍历-for-each与keySet
private static void forKeySetTravelse(Map map) {
Set set = map.keySet();
for (String key : set) {
Integer value = map.get(key);
System.out.print(key + ":" + value + " ");
}
System.out.println();
}
// map遍历-迭代器与keySet
private static void iteratorKeySetTravelse(Map map) {
Set set = map.keySet();
Iterator it = set.iterator();
while(it.hasNext()) {
String key = it.next();
Integer value = map.get(key);
System.out.print(key + ":" + value + " ");
}
System.out.println();
}
// map遍历-for-each与entry
private static void forEntryTravelse(Map map) {
Set> set = map.entrySet();
for (Map.Entry entry : set) {
String key = entry.getKey();
Integer value = entry.getValue();
System.out.print(key + ":" + value + " ");
}
System.out.println();
}
// map遍历-迭代器与entry
private static void iteratorEntryTravelse(Map map) {
Set> set = map.entrySet();
Iterator> it = set.iterator();
while (it.hasNext()) {
Entry en = it.next();
String key = en.getKey();
Integer value = en.getValue();
System.out.print(key + ":" + value + " ");
}
System.out.println();
}
} 
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