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Basic Java program to Remove specified element from TreeSet example
Posted: Mar 9, 2016 5:41 AM
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1.Basic java example program to remove specified element from treeset. package com.TreeSetExamplePrograms; public Class TreeSetRemoveDemo{ import java.util.TreeSet; public static void main(String args[]) { //create TreeSet object TreeSet<Integer> treeSet = new TreeSet<Integer>(); //add elements to TreeSet object treeSet.add(11); treeSet.add(12); treeSet.add(13); System.out.println("TreeSet before removal : " + treeSet); /* To remove an element from Java TreeSet object use, boolean remove(Object o) method. This method removes an element from TreeSet if it is present and returns true. Otherwise remove method returns false. */ boolean isRemoved = treeSet.remove(13); System.out.println("Was 13 removed from TreeSet ? " + isRemoved); System.out.println("TreeSet elements after removal : " + treeSet); } } Output: TreeSet before removal : [11, 12, 13] Was 13 removed from TreeSet ? true TreeSet elements after removal : [11, 12]
Remove all elements from Java TreeSet example: 1.Basic java example program to remove all elements from treeset. package com.TreeSetExamplePrograms; public Class TreeSetRemoveDemo{ import java.util.TreeSet; public static void main(String args[]) { //create TreeSet object TreeSet<Integer> treeSet = new TreeSet<Integer>(); //add elements to TreeSet object treeSet.add(11); treeSet.add(12); treeSet.add(13); System.out.println("TreeSet before removal : " + treeSet); treeSet.clear(); System.out.println("TreeSet after removal : " + treeSet); /* To check whether TreeSet contains any elements or not use boolean isEmpty() method. isEmpty() method returns true if the TreeSet does not contains any elements otherwise returns false. */ System.out.println("Is TreeSet empty ? " + treeSet.isEmpty()); } } Output: TreeSet before removal : [11, 12, 13] TreeSet after removal : [] Is TreeSet empty ? true
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