[JAVA]比對Collection的值是否一樣

可以用containsKey去檢查map的key是否一樣
如此就不用一個一個去比對


http://www.roseindia.net/tutorial/java/core/hashMap/containsKey.html

HashMapContainsKey.java

package net.roseindia.java; import java.util.HashMap; public class HashMapContainsKey { public static void main(String[] arr) { /* Create object of HashMap */ HashMap<Integer, String> obMap = new HashMap<Integer, String>(); /* Add value in HashMap */ obMap.put(new Integer(1), "Bharat"); obMap.put(new Integer(2), "Gyan"); obMap.put(new Integer(4), "Vrishti"); obMap.put(new Integer(3), "Sarika"); obMap.put(new Integer(5), "Rohit"); obMap.put(new Integer(6), "Parineeta"); /* Check key present in HashMap or not */ System.out.println("Returns :" + obMap.containsKey(1)); System.out.println("Returns :" + obMap.containsKey(8)); } }