package finalize;

public class FinalizeExample {

@Override

protected void finalize() throws Throwable {

System.out.println("Finalize called");

}

public static void main(String[] args) {

for (int i = 0; i < 10000000; i++) {

FinalizeExample f = new FinalizeExample();

}

}

}

public class GC {

public static void main(String[] args) {

GC gc = new GC();

StringBuffer sb = gc.createStrings();

}

public StringBuffer createStrings() {

StringBuffer sb1 = new StringBuffer("hello");

StringBuffer sb2 = new StringBuffer("world");

return sb2;

}

}

package parameters;

public class Primatives {

public static void main(String[] args) {

int num1 = 5;

System.out.println("Value at point 1 is "+num1);

changeMe(num1);

System.out.println("Value at point 3 is "+num1);

}

private static void changeMe(int num) {

num += 5;

System.out.println("Value at point 2 is "+num);

}

}

package parameters;

public class PassObject2 {

public static void main(String[] args) {

StringBuffer sb = new StringBuffer("Hello");

System.out.println("Value at point 1 is "+sb);

changeMe(sb);

System.out.println("Value at point 3 is "+sb);

}

private static void changeMe(StringBuffer sb1) {

sb1.append(" World");

System.out.println("Value at point 2 is "+sb1);

}

}

package parameters;

public class PassObject3 {

public static void main(String[] args) {

String s = "Hello";

System.out.println("Value at point 1 is "+s);

changeMe(s);

System.out.println("Value at point 3 is "+s);

}

private static void changeMe(String s) {

s += " World";

System.out.println("Value at point 2 is "+s);

}

}

package nullexample;

public class NullString {

public static void main(String[] args) {

StringBuffer sb = null;

sb.append("Hello");

}

}

package nullexample;

public class NullString {

public static void main(String[] args) {

StringBuffer sb;

sb.append("Hello");

}

}