The document discusses constructors in Java. It explains that the new keyword is used to create an object and precedes a call to the class constructor. The constructor initializes the new object and can only be called by other constructors or static methods. It provides an example BankAccount class with a no-argument constructor that calls another constructor with a parameter, and a constructor that initializes the balance field and calls a static method.

1. Class 6
 Exposure: Group #7
 Return of an object
 The keyword new
 Constructor call
Return of an object
The keyword new
 The new keyword is a Java operator that creates the object .
 The new operator precedes a call to a constructor , which initializes the new
object .
Constructor call
 A constructor can only be called by other constructors or class methods
(static).
public class BankAccount{
// member attributes or variables
private double balance;
public static int TotalAccounts =0;
// methods
public BankAccount ( ) {
this(0.0); // constructor call has a parameter
}
public BankAccount( double ingreso ) {
balance = write;
incAccount ();
}
public double balance () {
return balance;
}
public static void incCuentas () {
TotalAccounts ++;
}
public void transfer (BankAccount origen ) {
balance += origin. balance;
origin. balance =0;

2. public class suma2 {
public int a;
public int b;
public int c;
public suma2(int a, int b)
{
this.a=a;
this.b=b;
}
public void setCalculo()
{
c=(a+b)*-1;
}
public void getMostrar()
{
System.out.println("la suma es:"+c);
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
suma2 e=new suma2(4,5);
e.setCalculo();
e.getMostrar();
}
}