public class Main {

/**
* Lists the system properties
*/
public void copyArrayExample() {

int[] intArray = new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

int[] arrayCopy = new int[intArray.length];

System.arraycopy(intArray, 0, arrayCopy, 0, intArray.length);

for (int i = 0; i < arrayCopy.length; i++)
System.out.println(arrayCopy[i]);

}


/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new Main().copyArrayExample();
}
}import java.util.Arrays;

/**
*
* @author javadb.com
*/
public class Main {

/**
* Creates objects using the Car class which implements the Comparable
* interface.
* Compares and sorts the objects by mileage.
*/
public void comparableExample() {

//Creating the objects that implements the Comparable interface
Car car1 = new Car("Toyota", 2006, 5000);
Car car2 = new Car("BMW", 2007, 5000);
Car car3 = new Car("Chrysler", 2007, 4000);

//Comparing the objects by calling the compareTo method on one of them
//passing another object as argument.
System.out.println("Car 1 equals Car 2: " + car1.compareTo(car2));
System.out.println("Car 1 equals Car 3: " + car1.compareTo(car3));
System.out.println("Car 2 equals Car 3: " + car2.compareTo(car3));
System.out.println();

//To sort them we create an array which is passed to the Arrays.sort()
//method.
Car[] carArray = new Car[] {car1, car2, car3};
Arrays.sort(carArray);

//Print out the sorted array
for (Car car : carArray)
System.out.println(car.toString());
}

//The Car class used to compare and sort objects.
class Car implements Comparable {

private String make;
private int year;
private int mileage;

public Car(String make, int year, int mileage) {

this.make = make;
this.year = year;
this.mileage = mileage;
}

//Mandatory method when implementing the
//Comparable interface. In this method we
//compare the mileage of the two car objects.
public int compareTo(Object obj) {

if (obj instanceof Car) {

Car car = (Car) obj;
if (this.mileage > car.getMileage())
return 1;
else if (this.mileage < car.getMileage())
return -1;
}
return 0;
}

public void setMake(String make) {
this.make = make;
}

public void setYear(int year) {
this.year = year;
}

public void setMileage(int mileage) {
this.mileage = mileage;
}

public String getMake() {
return make;
}

public int getYear() {
return year;
}

public int getMileage() {
return mileage;
}

public String toString() {

StringBuffer buffer = new StringBuffer();
buffer.append("Make: " + make + "\n");
buffer.append("Year: " + year + "\n");
buffer.append("Mileage: " + mileage + "\n");

return buffer.toString();
}
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new Main().comparableExample();
}
}




The output from the code example above is:

Car 1 equals Car 2: 0
Car 1 equals Car 3: 1
Car 2 equals Car 3: 1

Make: Chrysler
Year: 2007
Mileage: 4000

Make: Toyota
Year: 2006
Mileage: 5000

Make: BMW
Year: 2007
Mileage: 5000