Java Examples - Array Intersection
Java ExamplesThe following example demonstrates how to use the retainAll () method to calculate the intersection of two arrays:
Main.java file
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
ArrayList objArray = new ArrayList();
ArrayList objArray2 = new ArrayList();
objArray2.add(0,"common1");
objArray2.add(1,"common2");
objArray2.add(2,"notcommon");
objArray2.add(3,"notcommon1");
objArray.add(0,"common1");
objArray.add(1,"common2");
objArray.add(2,"notcommon2");
System.out.println("Elements of array1:"+objArray);
System.out.println("Elements of array2:"+objArray2);
objArray.retainAll(objArray2);
System.out.println("The intersection of array2 & array1 is:"+objArray);
}
}
The output of running the above code is:
array1 数组元素：[common1, common2, notcommon2] array2 数组元素：[common1, common2, notcommon, notcommon1] array2 & array1 数组交集为：[common1, common2]Other Extensions