Syntax:
public boolean removeAll(Collection c)
Parameters:
// Java program to Remove One Array From Another Array import java.util.ArrayList; import java.util.List; class GFG { public static void main(String[] args) { // creating first array List firstList = new ArrayList<>(); // creating second array List secondList = new ArrayList<>(); // adding elements in first array firstList.add(100); firstList.add(200); firstList.add(300); firstList.add(400); firstList.add(500); firstList.add(600); // adding elements in second array secondList.add(300); secondList.add(500); // displaying element of first array System.out.println("elements in first array " + firstList); // displaying element of second array System.out.println("elements in second array " + secondList); // removing elements from firstarray firstList.removeAll(secondList); // displaying elements of first array // after removing elements of second array // from first array System.out.println("first array after removing second array from first array\n" + firstList); } }
Output
elements in first array [100, 200, 300, 400, 500, 600] elements in second array [300, 500] first array after removing second array from first array [100, 200, 400, 600]
Example 2:
// Java program to Remove One Array From Another Array import java.io.*; import java.util.*; class friendsDetail { // class field private String name; private String nickName; // parameterised constructor public friendsDetail(String name, String nickName) { this.name = name; this.nickName = nickName; } // getter for name public String getName() { return name; } // setter for name public void setName(String name) { this.name = name; } // getter for nickname public String getnickName() { return nickName; } // setter for nickname public void setNickName(int id) { this.nickName = nickName; } @Override public boolean equals(Object o) { if (this == o) return true; if (!(o instanceof friendsDetail)) return false; friendsDetail that = (friendsDetail)o; return Objects.equals(getName(), that.getName()) && Objects.equals(nickName, that.nickName); } @Override public int hashCode() { return Objects.hash(getName(), nickName); } // overriding toString method public String toString() { // return super.toString(); return "(" + this.getName() + ":" + this.getnickName() + ")"; } } public class GFG { public static void main(String[] args) { ArrayList firstArrayList = new ArrayList<>(); System.out.println("Our First ArrayList\n"); // adding elements to first ArrayList firstArrayList.add(new friendsDetail("Amit", "Ghulla")); firstArrayList.add(new friendsDetail("Yashdeep", "Dopa")); firstArrayList.add(new friendsDetail("Jyoti", "Kauwa")); firstArrayList.add(new friendsDetail("Suraj", "Bhindi")); firstArrayList.add(new friendsDetail("Himanshu", "Lalten")); firstArrayList.add(new friendsDetail("Sarthak", "Nagin")); firstArrayList.add(new friendsDetail("Tsering", "Battak")); firstArrayList.add(new friendsDetail("Abhishek", "Liquid")); // Displaying output of first array using enhanced // for loop for (friendsDetail friend : firstArrayList) { System.out.println(friend); } ArrayList secondArrayList = new ArrayList<>(); System.out.println("\nOur Second ArrayList\n"); // adding elements to second ArrayList. secondArrayList.add(new friendsDetail("Amit", "Ghulla")); secondArrayList.add(new friendsDetail("Jyoti", "Kauwa")); secondArrayList.add(new friendsDetail("Himanshu", "Lalten")); secondArrayList.add(new friendsDetail("Abhishek", "Liquid")); // Displaying output of original array using // enhanced for loop for (friendsDetail friend : secondArrayList) { System.out.println(friend); } // removing second array elements from first array firstArrayList.removeAll(secondArrayList); System.out.println( "\nFirst array after removing second array from first array\n"); // Displaying first array after removing second // array elements from first array for (friendsDetail friend : firstArrayList) { System.out.println(friend); } } }
Output
Our First ArrayList (Amit:Ghulla) (Yashdeep:Dopa) (Jyoti:Kauwa) (Suraj:Bhindi) (Himanshu:Lalten) (Sarthak:Nagin) (Tsering:Battak) (Abhishek:Liquid) Our Second ArrayList (Amit:Ghulla) (Jyoti:Kauwa) (Himanshu:Lalten) (Abhishek:Liquid) First array after removing second array from first array (Yashdeep:Dopa) (Suraj:Bhindi) (Sarthak:Nagin) (Tsering:Battak)