Binary Addition

String input0 = "1";
String input1 = "1";

int number0 = Integer.parseInt(input0, 2);
int number1 = Integer.parseInt(input1, 2);

int sum = number0 + number1;
System.out.println(Integer.toBinaryString(sum));

10

import java.util.concurrent.atomic.AtomicInteger;

public class PassByReference {
    
    public static void changeAtomicInteger(AtomicInteger n) {
        System.out.println("In changeAtomicInteger method");
        System.out.println("\tBefore change: n = " + 
                            n + // prints 5
                            " hash code = " + 
                            n.hashCode()); 
        n.set(n.get() + 10);  // at this point, we are clearly working with reference data type
        System.out.println("\tAfter change: n = " + 
                            n + // prints 15
                            " hash code = " + 
                            n.hashCode()); 
}

    public static void main(String[] args) {
        AtomicInteger n = new AtomicInteger(5); // unlike conventional wrapper class, this requires new
        System.out.println("Main method before changeAtomicInteger(n): n = " + 
                            n + // prints 5
                            " hash code = " + 
                            n.hashCode()); 
        changeAtomicInteger(n);
        System.out.println("Main method after changeAtomicInteger(n): n = " + 
                            n +  // now prints 15
                            " hash code = " + 
                            n.hashCode()); 
    }
}
PassByReference.main(null);

Main method before changeAtomicInteger(n): n = 5 hash code = 915254697
In changeAtomicInteger method
	Before change: n = 5 hash code = 915254697
	After change: n = 15 hash code = 915254697
Main method after changeAtomicInteger(n): n = 15 hash code = 915254697

public class IntByReference {
    private int value;

    public IntByReference(Integer value) {
        this.value = value;
    }

    public String toString() {
        return (String.format("%d", this.value));
    }

    public void swapToLowHighOrder(IntByReference i) {
        if (this.value > i.value) {
            int tmp = this.value;
            this.value = i.value;
            i.value = tmp;
        }
    }

    public static void swapper(int n0, int n1) {
        IntByReference a = new IntByReference(n0);
        IntByReference b = new IntByReference(n1);
        System.out.println("Before: " + a + " " + b);
        a.swapToLowHighOrder(b);  // conditionally build swap method to change values of a, b
        System.out.println("After: " + a + " " + b);
        System.out.println();
    }

    public static void main(String[] ags) {
        IntByReference.swapper(21, 16);
        IntByReference.swapper(16, 21);
        IntByReference.swapper(16, -1);
    }

}
IntByReference.main(null);

Before: 21 16
After: 16 21

Before: 16 21
After: 16 21

Before: 16 -1
After: -1 16