Question

Design a program to let user enter two lists of numbers within the range [0, 9] from keyboard, you could either use flag to denote end of the list or ask user to enter the list size first and then enter the list numbers. Each of these two lists represents a set (keep in mind that duplicate elements are not allowed in a set), so we have two sets A and B. Suppose the universal set is U 0, 1,2,,9). Write a program implementing the following functions: (a) Print out AUB. (b) Print out AnB. (c) Print out B d) Print out (AnB) x A

need java code. (d) is cartesian product rule.

Answer 1

import java.util.HashSet;

import java.util.Iterator;

import java.util.Scanner;

import java.util.Set;

public class TestSet {

public static void main(String[] args) {

Set<Integer> U = new HashSet<Integer>();

Set<Integer> A = new HashSet<Integer>();

Set<Integer> B = new HashSet<Integer>();

Set<Integer> union = new HashSet<Integer>();

Set<Integer> BDash = new HashSet<Integer>();

Set<Integer> intersection = new HashSet<Integer>();

Scanner sc= new Scanner(System.in);

for(int i=0;i<10;i++){

U.add(i);

}

BDash.addAll(B);

System.out.println("Enter set A element(Enter -1 to exit){Range: 0 to 9}");

for(;;){

int element = sc.nextInt();

if(element == -1){

break;

}

A.add(element);

}

System.out.println("Enter set B element(Enter -1 to exit){Range: 0 to 9}");

for(;;){

int element = sc.nextInt();

if(element == -1){

break;

}

B.add(element);

}

System.out.print("Value of (A U B) :");

union.addAll(A);

union.addAll(B);

System.out.println(union);

System.out.println("Value of (A intersection B) :");

intersection.addAll(A);

intersection.retainAll(B);

System.out.println(intersection);

System.out.println("Value of B': ");

BDash.addAll(U);

BDash.removeAll(B);

System.out.println(BDash);

System.out.println("Value of (A intersection B)XA :");

System.out.println("{");

Object[] colorObj1 = intersection.toArray();

Object[] colorObj2 = A.toArray();

for(int i=0;i<colorObj1.length;i++){

for(int j=0;j<colorObj2.length;j++){

System.out.println("("+colorObj1[i]+","+colorObj2[j]+")");

}

}

System.out.println("}");

}

}