pass-by-ref-2.cs

public class Test {
	public static void main(String[] args) {
		A a = new A(5);	
		System.out.println(a.a);
		test(a);
		System.out.println(a.a);
	}
	
	public static void test(A a) {
		a.a = 3 ;
	}
}
	
class A {
	private int _a;
	
	public A(int value) {
		this.a = value;
	}
	
	public double a
	{
		get { return _a; }
		set { _a = value; }
	}
}

pass-by-reference.cs

public class Test {
	public static void main(String[] args) {
		A a = new A(5);	
		System.out.println(a.getValue());
		test(a);
		System.out.println(a.getValue());
	}
	
	public static void test(A a) {
		a.setA(3);
	}
}	

class A {
	private int value;
	
	public A(int initialValue) {
		this.value = initialValue;
	}
	
	public void setA(int newValue) {
		this.value = newValue;
	}
	
	public int getValue() {
		return this.value;
	}
}

pass-by-value.cs

public class Test {
	public static void main(String[] args) {
		int a = 5;
		System.out.println(a);
		test(a);
		System.out.println(a);
	}

	public static void test(int a) {
		a = 3;
	}
}