public class Main1 {
    public static void main(String[] args) {
        // (1)Primitive type declaration and initialization
        int a = 0;
        int b = 1;
        System.out.println("a: " + a);
        System.out.println("b: " + b);

        // (2)Primitive type assignment
        b = a;
        System.out.println("a: " + a);
        System.out.println("b: " + b);

        // (3)Primitive type assignment
        a = 2;
        System.out.println("a: " + a);
        System.out.println("b: " + b);
    }
}

public static void main(String[] args) {
    int a = 1;
    int b = a;
    b = 2;
    System.out.println(a);
    System.out.println(b);
}

1
2

public static void main(String[] args) {
    int[] a = {1, 2, 3};
    int[] b = a;
    b[0] = 5;
    System.out.println(a[0]);
    System.out.println(b[0]);
}

5
5

/**
 *Class representing a circle
 */
public class Circle {
    /**Field representing the radius*/
    public int radius;
}

public class Main2 {
    public static void main(String[] args) {

        // (4)Reference type instantiation and field assignment
        Circle c1 = new Circle();
        c1.radius = 0;
        Circle c2 = new Circle();
        c2.radius = 1;
        System.out.println("c1.radius: " + c1.radius);
        System.out.println("c2.radius: " + c2.radius);

        // (5)Reference type assignment
        c2 = c1;
        System.out.println("c1.radius: " + c1.radius);
        System.out.println("c2.radius: " + c2.radius);

        // (6)Assign to a reference type field
        c1.radius = 2;
        System.out.println("c1.radius: " + c1.radius);
        System.out.println("c2.radius: " + c2.radius);
    }
}

c1.radius:0
c2.radius:1
c1.radius:0
c2.radius:0
c1.radius:2
c2.radius:2

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