public   class  Airplane  extends  Vehicle
  Seat pilot;
   public  Airplane() { 
    pilot =  new  Seat(); 
  }
}

 public   class  Airplane  extends  Vehicle
  Seat pilot;
   public  Airplane() { 
    pilot =  new  Seat(); 
  }
}

// проверим, равен ли первый аргумент "-a"
 if  (args[ 0 ] == "-a") {
    optionsAll = true;
}

//  проверим, равен ли первый аргумент "-a"
 if  ("-a".equals(args[ 0 ])) {
    optionsAll = true;
}

// Создаем массив из StringBuffer
StringBuffer [] myTempBuffers;
myTempBuffers =  new  StringBuffer[ 3 ];
myTempBuffers[ 0 ].add(data);

// Создаем массив из StringBuffer и инициализируем элементы
StringBuffer [] myTempBuffers;
myTempBuffers =  new  StringBuffer[ 3 ];
 for  ( int  ix =  0 ; ix < myTempBuffers.length; ix++) 
     myTempBuffers[ix] =  new  StringBuffer();

myTempBuffers[ 0 ].add(data);

 public   class  Point3 {
     int  i =  0 ;    
     int  j =  0 ;    
     int  k =  0 ;

     public   boolean  hits(Point[] p2list) {
       for ( int  i =  0 ; i < p2list.length; i++) {
        Point p2 = p2list[i];
         if  (p2.x == i && p2.y == j)
           return  true;
      }
       return  false;
    }
}

  // One way to fix the problem
   int  i =  0 ;    
   int  j =  0 ;    
   int  k =  0 ;

   public   boolean  hits(Point[] p2list) {
     for ( int  i =  0 ; i < p2list.length; i++) {
      Point p2 = p2list[i];
       if  (p2.x ==  this .i && p2.y ==  this .j)
         return  true;
    }
     return  false;
  }

  // *****************************
  // Более лучший способ
   int  x =  0 ;    
   int  y =  0 ;    
   int  z =  0 ;

   public   boolean  hits(Point[] p2list) {
     for ( int  i =  0 ; i < p2list.length; i++) {
      Point p2 = p2list[i];
       if  (p2.x == x && p2.y == y)
         return  true;
    }
     return  false;
  }

 public   class  Test {
    private   int  param =  0 ;

    public  Test( int  param) {
       this .param = param;
   }
}

 public   class  JavaClassFile  extends  File {
    String classname;
     public  JavaClassFile(String cl) {
        classname = cl;
    }
}

 public   class  JavaClassFile  extends  File {
    String classname;
     public  JavaClassFile(String cl) {
         super (cl + ".class");
        classname = cl;
    }
}

 try  {
    stream1 =  new  FileInputStream("data.txt");
}  catch  (IOException) { 
    message("Could not open data.txt");
}

 try  {
   stream1 =  new  FileInputStream("data.txt");
}  catch  (IOException ie) { 
   message("Could not open data.txt: " + ie);
}

 try  {
    serviceSocket.setSoTimeout( 1000 );
    newsock = serviceSocket.accept();
}  catch  (IOException ie) { 
    message("Error accepting connection.");
}  catch  (SocketException se) {
    message("Error setting time-out.");
}

 try  {
    serviceSocket.setSoTimeout( 1000 );
    newsock = serviceSocket.accept();
}  catch  (SocketException se) {
    message("Error setting time-out.");
}  catch  (IOException ie) { 
    message("Error accepting connection.");
}

 public   void  waitFor( int  sec) {
    Thread.sleep(sec *  1000 );
}

 public   void  waitFor( int  sec)  throws  InterruptedException {
    Thread.sleep(sec *  1000 );
}

 public   class  Line {
     private  Point start, end;
     public   void  getStart() { 
       return  start; 
    }
}

 public   class  Line {
     private  Point start, end;
     public  Point getStart() { 
       return  start; 
    }
}

 public   static   void  main(String[] args) {
  ...
}

 public   class  DivTest {
     boolean  divisible( int  x,  int  y) {
         return  (x % y ==  0 );
    }

     public   static   void  main(String[] args) {
         int  v1 =  14 ;
         int  v2 =  9 ;

        // на следующие строки компилятор выдаст ошибку
         if  (divisible(v1, v2)) {
            System.out.println(v1 + " is a multiple of " + v2);
        }  else  {
            System.out.println(v2 + " does not divide " + v1);
        }
    }
}

 public   class  DivTest {
     int  modulus;

     public  DivTest( int  m) { 
      modulus = m; 
    }
    
     boolean  divisible( int  x) {
         return  (x % modulus ==  0 );
    }

     public   static   void  main(String[] args) {
         int  v1 =  14 ;
         int  v2 =  9 ;

        DivTest tester =  new  DivTest(v2);

         if  (tester.divisible(v1) {
            System.out.println(v1 + " is a multiple of " + v2);
        }  else  {
            System.out.println(v2 + " does not divide " + v1);
        }
    }
}

 public   class  DivTest {
     static   boolean  divisible( int  x,  int  y) {
         return  (x % y ==  0 );
    }

     public   static   void  main(String[] args) {
         int  v1 =  14 ;
         int  v2 =  9 ;

         if  (divisible(v1, v2)) {
            System.out.println(v1 + " is a multiple of " + v2);
        }  else  {
            System.out.println(v2 + " does not divide " + v1);
        }
    }
}

 public   static   void  main(String args[]) {
   String test1 = "Today is ";
   appendTodaysDate(test1);
   System.out.println(test1);
}

/* прим. редактора: закомментированный метод должен иметь модификатор
    static (здесь автором допущена ошибка №9)
public void appendTodaysDate(String line) {
    line = line + (new Date()).toString();
}
*/

 public   static   void  appendTodaysDate(String line) {
    line = line + ( new  Date()).toString();
}

 public   static   void  main(String args[]) {
   String test1 = "Today is ";
   test1 = appendTodaysDate(test1);
   System.out.println(test1);
}

 public   static  String appendTodaysDate(String line) {
     return  (line + ( new  Date()).toString());
}

 public   static   void  main(String args[]) {
   StringBuffer test1 =  new  StringBuffer("Today is ");
   appendTodaysDate(test1);
   System.out.println(test1.toString());
}

 public   static   void  appendTodaysDate(StringBuffer line) {
    line.append(( new  Date()).toString());
}

 public   class  IntList {
    Vector list;

    // Выглядит как конструктор, но на самом деле это метод
     public   void  IntList() {
        list =  new  Vector();
    }

     public  append( int  n) {
        list.addElement( new  Integer(n));
    }
}

 public   class  IntList {
    Vector list;

    // Это конструктор
     public  IntList() {
        list =  new  Vector();
    }

     public  append( int  n) {
        list.addElement( new  Integer(n));
    }
}

Object arr[] =  new  Object[ 10 ];
arr[ 0 ] = "m"; 
arr[ 1 ] =  new  Character('m');

String arg = args[ 0 ];
 if  (arr[ 0 ].compareTo(arg) <  0 ) {
    System.out.println(arg + " comes before " + arr[ 0 ]);
}

Object arr[] =  new  Object[ 10 ];
arr[ 0 ] = "m"; 
arr[ 1 ] =  new  Character('m');

String arg = args[ 0 ];
 if  ( ((String) arr[ 0 ]).compareTo(arg) <  0 ) {
    System.out.println(arg + " comes before " + arr[ 0 ]);
}

 public   class  SharkSim  extends  Runnable {
     float  length;
    ...
}

 public   class  SharkSim  implements  Runnable {
     float  length;
    ...
}

// Неправильный порядок
 public   class  SharkSim  implements  Swimmer  extends  Animal {
     float  length;
    ...
}

// ключевое слово implements встречается несколько раз
 public   class  DiverSim  implements  Swimmer  implements  Runnable {
     int  airLeft;
    ...
}

// Правильный порядок
 public   class  SharkSim  extends  Animal  implements  Swimmer {
     float  length;
    ...
}

// Несколько интерфейсов разделяются запятыми
 public   class  DiverSim  implements  Swimmer, Runnable {
     int  airLeft;
    ...
}

 public   class  GraphicalRectangle  extends  Rectangle {
      Color fillColor;
       boolean  beveled;
      ...
       public  String toString() {
           super ();
           return ("color=" + fillColor + ", beveled=" + beveled);
      }
}

public class GraphicalRectangle extends Rectangle {
      Color fillColor;
      boolean beveled;
      ...
      public String toString() {
          String rectStr = super();
          return(rectStr + " - " +
         "color=" + fillColor + ", beveled=" + beveled);
      }
}

 public   class  TestFrame  extends  Frame  implements  ActionListener {
     public  Button exit;

     public  TestFrame() {
         super ("Test Frame");
        exit =  new  Button("Quit");
    }
}

 public   class  TestFrame  extends  Frame  implements  ActionListener {
     public  Button exit;

     public  TestFrame() {
         super ("Test Frame");

        exit =  new  Button("Quit");

        Panel controlPanel =  new  Panel();
        controlPanel.add(exit);

        add("Center", controlPanel);

        exit.addActionListener( this );
    }

     public   void  actionPerformed(ActionEvent e) {
        System.exit( 0 );
    }
}

 public   class  AnimCanvas  extends  Canvas  implements  Runnable {
         protected  Thread myThread;
         public  AnimCanvas() {
                myThread =  new  Thread( this );
        }

        // метод run() не будет вызван,
        // потому что поток не запущен.
         public   void  run() {
                 for ( int  n =  0 ; n <  10000 ; n++) {
                    try  { 
                     Thread.sleep( 100 ); 
                   }  catch  (InterruptedException e) { }
                   
                   animateStep(n);
                }       
        }
        ...
}

 public   class  AnimCanvas  extends  Canvas  implements  Runnable {
         static   final   int  LIMIT =  10000 ;
         protected  Thread myThread;

         public  AnimCanvas() {
                myThread =  new  Thread( this );
                myThread.start();
        }

         public   void  run() {
                 for ( int  n =  0 ; n < LIMIT; n++) {
                         try  { 
                          Thread.sleep( 100 ); 
                        }  catch  (InterruptedException e) { }

                        animateStep(n);
                }
        }
        ...
}

 public   class  LineReader {
     private  DataInputStream dis;

     public  LineReader(InputStream is) {
        dis =  new  DataInputStream(is);
    }

     public  String getLine() { 
        String ret =  null ;

         try  {
          ret = dis.readLine();  // Неправильно! Запрещено.
        }  catch  (IOException ie) { }

         return  ret;
    }
}

 public   class  LineReader {
     private  BufferedReader br;

     public  LineReader(InputStream is) {
        br =  new  BufferedReader( new  InputStreamReader(is));
    }

     public  String getLine() { 
        String ret =  null ;

         try  {
          ret = br.readLine(); 
        }  catch  (IOException ie) { }

         return  ret;
    }
}

 byte  byteValue1 =  17 ; /* неправильно! */
 byte  byteValue2 = ( byte ) 19 ; /* правильно */ 

 float  realValue1 = - 1 . 7 ;          /* неправильно! */
 float  realValue2 = ( float )(- 1 . 9 ); /* правильно */ 

 float  realValue1 =  1 . 7 ;    /* неправильно! */
 float  realValue2 =  1 .9f;   /* правильно */ 

 float  realValue1 =  1 .7f; 
 double  realValue2 =  1 . 9 ;
realValue1 = ( float )realValue2;