test2
package com.journaldev.util; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; public class ConcurrentHashMapExample { public static void main(String[] args) { //ConcurrentHashMap Map<String,String> myMap = new ConcurrentHashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("ConcurrentHashMap before iterator: "+myMap); Iterator<String> it = myMap.keySet().iterator(); while(it.hasNext()){ String key = it.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("ConcurrentHashMap after iterator: "+myMap); //HashMap myMap = new HashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("HashMap before iterator: "+myMap); Iterator<String> it1 = myMap.keySet().iterator(); while(it1.hasNext()){ String key = it1.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("HashMap after iterator: "+myMap); } }
package com.journaldev.util; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; public class ConcurrentHashMapExample { public static void main(String[] args) { //ConcurrentHashMap Map<String,String> myMap = new ConcurrentHashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("ConcurrentHashMap before iterator: "+myMap); Iterator<String> it = myMap.keySet().iterator(); while(it.hasNext()){ String key = it.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("ConcurrentHashMap after iterator: "+myMap); //HashMap myMap = new HashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("HashMap before iterator: "+myMap); Iterator<String> it1 = myMap.keySet().iterator(); while(it1.hasNext()){ String key = it1.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("HashMap after iterator: "+myMap); } }
package com.journaldev.util; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; public class ConcurrentHashMapExample { public static void main(String[] args) { //ConcurrentHashMap Map<String,String> myMap = new ConcurrentHashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("ConcurrentHashMap before iterator: "+myMap); Iterator<String> it = myMap.keySet().iterator(); while(it.hasNext()){ String key = it.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("ConcurrentHashMap after iterator: "+myMap); //HashMap myMap = new HashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("HashMap before iterator: "+myMap); Iterator<String> it1 = myMap.keySet().iterator(); while(it1.hasNext()){ String key = it1.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("HashMap after iterator: "+myMap); } }
package com.journaldev.util; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; public class ConcurrentHashMapExample { public static void main(String[] args) { //ConcurrentHashMap Map<String,String> myMap = new ConcurrentHashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("ConcurrentHashMap before iterator: "+myMap); Iterator<String> it = myMap.keySet().iterator(); while(it.hasNext()){ String key = it.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("ConcurrentHashMap after iterator: "+myMap); //HashMap myMap = new HashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("HashMap before iterator: "+myMap); Iterator<String> it1 = myMap.keySet().iterator(); while(it1.hasNext()){ String key = it1.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("HashMap after iterator: "+myMap); } }
package com.journaldev.util; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; public class ConcurrentHashMapExample { public static void main(String[] args) { //ConcurrentHashMap Map<String,String> myMap = new ConcurrentHashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("ConcurrentHashMap before iterator: "+myMap); Iterator<String> it = myMap.keySet().iterator(); while(it.hasNext()){ String key = it.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("ConcurrentHashMap after iterator: "+myMap); //HashMap myMap = new HashMap<String,String>(); myMap.put("1", "1"); myMap.put("2", "1"); myMap.put("3", "1"); myMap.put("4", "1"); myMap.put("5", "1"); myMap.put("6", "1"); System.out.println("HashMap before iterator: "+myMap); Iterator<String> it1 = myMap.keySet().iterator(); while(it1.hasNext()){ String key = it1.next(); if(key.equals("3")) myMap.put(key+"new", "new3"); } System.out.println("HashMap after iterator: "+myMap); } }