JAVAcılar ve JAVAcılara KATKIDA BULUNMAK İSTEYENLER BURAYA

/** A class to represent Complex Numbers. A Complex object is 
   * immutable once created; the add, subtract and multiply routines 
   * return newly-created Complex objects containing the results. 
   * 
   * @author Ian F. Darwin, inspired by David Flanagan. 
   * @version $Id: Complex.java,v 1.3 2004/05/13 22:28:59 ian Exp $ 
   */ 
  public class Complex { 
    /** The real part */ 
    private double r; 
    /** The imaginary part */ 
    private double i; 
   
    /** Construct a Complex */ 
    Complex(double rr, double ii) { 
      r = rr; 
      i = ii; 
    } 
   
    /** Display the current Complex as a String, for use in 
     * println() and elsewhere. 
     */ 
    public String toString() { 
      StringBuffer sb = new StringBuffer().append(r); 
      if (i>0) 
        sb.append('+');  // else append(i) appends - sign 
      return sb.append(i).append('i').toString(); 
    } 
   
    /** Return just the Real part */ 
    public double getReal() { 
      return r; 
    } 
    /** Return just the Real part */ 
    public double getImaginary() { 
      return i; 
    } 
    /** Return the magnitude of a complex number */ 
    public double magnitude() { 
      return Math.sqrt(r*r + i*i); 
    } 
   
    /** Add another Complex to this one 
     */ 
    public Complex add(Complex other) { 
      return add(this, other); 
    } 
   
    /** Add two Complexes 
     */ 
    public static Complex add(Complex c1, Complex c2) { 
      return new Complex(c1.r+c2.r, c1.i+c2.i); 
    } 
   
    /** Subtract another Complex from this one 
     */ 
    public Complex subtract(Complex other) { 
      return subtract(this, other); 
    } 
   
    /** Subtract two Complexes 
     */ 
    public static Complex subtract(Complex c1, Complex c2) { 
      return new Complex(c1.r-c2.r, c1.i-c2.i); 
    } 
   
    /** Multiply this Complex times another one 
     */ 
    public Complex multiply(Complex other) { 
      return multiply(this, other); 
    } 
   
    /** Multiply two Complexes 
     */ 
    public static Complex multiply(Complex c1, Complex c2) { 
      return new Complex(c1.r*c2.r - c1.i*c2.i, c1.r*c2.i + c1.i*c2.r); 
    } 
   
    /** Divide c1 by c2. 
     * @author Gisbert Selke. 
     */ 
    public static Complex divide(Complex c1, Complex c2) { 
      return new Complex( 
        (c1.r*c2.r+c1.i*c2.i)/(c2.r*c2.r+c2.i*c2.i), 
        (c1.i*c2.r-c1.r*c2.i)/(c2.r*c2.r+c2.i*c2.i)); 
    } 
     
    /* Compare this Complex number with another 
     */ 
    public boolean equals(Object o) { 
      if (!(o instanceof Complex)) 
        throw new IllegalArgumentException( 
            "Complex.equals argument must be a Complex"); 
      Complex other = (Complex)o; 
      return r == other.r && i == other.i; 
    } 
     
    /* Generate a hashCode; not sure how well distributed these are. 
     */ 
    public int hashCode() { 
      return (int)( r) |  (int)i; 
    } 
   
    public static void main(String[] args) { 
      Complex c = new Complex(3,  5); 
      Complex d = new Complex(2, -2); 
      System.out.println(c); 
      System.out.println(c + ".getReal() = " + c.getReal()); 
      System.out.println(c + " + " + d + " = " + c.add(d)); 
      System.out.println(c + " + " + d + " = " + Complex.add(c, d)); 
      System.out.println(c + " * " + d + " = " + c.multiply(d)); 
      System.out.println(Complex.divide(c, d)); 
    } 
  } 
             

package be5021; 
  import javax.swing.*; 
  public class be502 {//class bloğu başlangıcı 
      public static void main(String[] args) {//main() fonksiyon başlangıcı 
          //Integer a=new Integer(0); 
          //Integer b=new Integer(0); 
          int a,b; 
          a=Integer.parseInt(JOptionPane.showInputDialog("1. tamsayıyı giriniz")); 
          b=Integer.parseInt(JOptionPane.showInputDialog("2. tamsayıyı giriniz")); 
          
          System.out.println(a+"+"+b+"="+(a+b)); 
          JOptionPane.showMessageDialog(null, a+"+"+b+"="+(a+b),"pencere başlığı",JOptionPane.INFORMATION_MESSAGE); 
      }//main() fonksiyon sonu 
  }//class bloğu sonu 
  

 
   
  package alp; 
   
   
  public class Main { 
   
   
      public static int toplama(int a, int b) 
  { 
   
  int sonuc = a+b; 
  return sonuc; 
   
  ya da 
   
  return a+b; 
   
  } 
      
      public static void main(String[] args) { 
   
        int sayi1=10; 
        int sayi2=25; 
         
        int toplam = toplama(sayi1,sayi2); 
        
        System.out.println("Sayıların toplamı:"+toplam); 
   
                
         
      } 
   
  }