- Java.util Package Classes
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- Java.util - Properties
- Java.util - PropertyPermission
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- Java.util - Random
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- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
Java Vector removeAll() Method
Description
The Java Vector removeAll(Collection<?> c) is used to remove all the elements of the vector that are contained in the specified Collection.
Declaration
Following is the declaration for java.util.Vector.removeAll() method
public boolean removeAll(Collection<?> c)
Parameters
c − This is a collection of elements to be removed from the Vector
Return Value
The method call returns true if this Vector changed as a result of the call.
Exception
NullPointerException − This exception is thrown if the specified collection is null.
Remove multiple Elements of a Vector of Integer Example
The following example shows the usage of Java Vector removeAll(collection) method. We're creating an Vector of Integers, adding some elements, print it and then use removeAll(collection) method to remove few elements. As Vector is modified it is printed to check if specified elements are removed or not.
package com.tutorialspoint; import java.util.Vector; import java.util.Arrays; public class VectorDemo { public static void main(String[] args) { // create an empty vector Vector<Integer> vector = new Vector<>(); // use add() method to add elements in the vector vector.add(20); vector.add(15); vector.add(30); vector.add(45); // let us print all the elements available in vector System.out.println("Vector = " + vector); // it will remove two common elements System.out.println("Vector modified: " + vector.removeAll(Arrays.asList(11,30,20,12))); // let us print all the elements available in vector again System.out.println("Vector = " + vector); } }
Output
Let us compile and run the above program, this will produce the following result −
Vector = [20, 15, 30, 45] Vector modified: true Vector = [15, 45]
Remove multiple Elements of a Vector of String Example
The following example shows the usage of Java Vector removeAll(collection) method. We're creating an Vector of Strings, adding some elements, print it and then use removeAll(collection) method to remove few elements. As Vector is modified it is printed to check if specified elements are removed or not.
package com.tutorialspoint; import java.util.Vector; import java.util.Arrays; public class VectorDemo { public static void main(String[] args) { // create an empty vector Vector<String> vector = new Vector<>(); // use add() method to add elements in the deque vector.add("A"); vector.add("B"); vector.add("C"); vector.add("D"); // let us print all the elements available in vector System.out.println("Vector = " + vector); // it will remove two common elements System.out.println("Vector modified: " + vector.removeAll(Arrays.asList("B","C","E"))); // let us print all the elements available in vector again System.out.println("Vector = " + vector); } }
Output
Let us compile and run the above program, this will produce the following result −
Vector = [A, B, C, D] Vector modified: true Vector = [A, D]
Remove multiple Elements of a Vector of Object Example
The following example shows the usage of Java Vector removeAll(collection) method. We're creating an Vector of Student objects, adding some elements, print it and then use removeAll(collection) method to remove few elements. As Vector is modified it is printed to check if specified elements are removed or not.
package com.tutorialspoint; import java.util.Vector; import java.util.Arrays; public class VectorDemo { public static void main(String[] args) { // create an empty vector Vector<Student> vector = new Vector<>(); // use add() method to add elements in the deque vector.add(new Student(1, "Julie")); vector.add(new Student(2, "Robert")); vector.add(new Student(3, "Adam")); vector.add(new Student(4, "Jene")); // let us print all the elements available in vector System.out.println("Vector = " + vector); // it will remove two common elements System.out.println("Vector modified: " + vector.removeAll(Arrays.asList(new Student(1, "Julie"),new Student(3, "Adam")))); // let us print all the elements available in vector again System.out.println("Vector = " + vector); } } class Student { int rollNo; String name; Student(int rollNo, String name){ this.rollNo = rollNo; this.name = name; } @Override public String toString() { return "[ " + this.rollNo + ", " + this.name + " ]"; } @Override public boolean equals(Object obj) { Student s = (Student)obj; return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name); } }
Output
Let us compile and run the above program, this will produce the following result −
Vector = [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ], [ 4, Jene ]] Vector modified: true Vector = [[ 2, Robert ], [ 4, Jene ]]
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