Java Lifetime Of Objects

how the Java-compiler manages the lifetime of objects. Aren't the variables a, b and, therefore, the objects A(i),B(i) destroyed after each iteration of the loop? Why then does the toString-method print out A(4), B(4) after finishing the for-loop?

Code:

public class mainClass {
public static void main(String[] args) {
C a = new A(0);
C b = new B(0);
for(int i=0;i<5;i++){
a = new A(i);
b = new B(i);
}
System.out.println(a+" "+b);
}
}