This article brings you an introduction to the implementation method of Java traversal (code examples), which has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
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<String> list = new ArrayList<String>(); 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<String, Integer> map = new HashMap<String, Integer>(); 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<String> list) { for (String str : list) { System.out.print(str + " "); } System.out.println(); } // 迭代器遍历 private static void iteratorTravelse(ArrayList<String> list) { Iterator<String> 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<String, Integer> map) { Set<String> 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<String, Integer> map) { Set<String> set = map.keySet(); Iterator<String> 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<String, Integer> map) { Set<Entry<String, Integer>> set = map.entrySet(); for (Map.Entry<String, Integer> 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<String, Integer> map) { Set<Entry<String, Integer>> set = map.entrySet(); Iterator<Entry<String, Integer>> it = set.iterator(); while (it.hasNext()) { Entry<String, Integer> en = it.next(); String key = en.getKey(); Integer value = en.getValue(); System.out.print(key + ":" + value + " "); } System.out.println(); } }
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