Constructor - Scala vs. Java

1. Constructor With Parameters

Java Code

public class Foo() {  
   public Bar bar;  
   public Foo(Bar bar) {  
       this.bar = bar;  
   }  
}  

Scala Code

class Foo(val bar:Bar)  

2. Constructor With Private Attribute

Java Code

public class Foo() {  
   private final Bar bar;  
   public Foo(Bar bar) {  
       this.bar = bar;  
   }  
}  

Scala Code

class Foo(private val bar:Bar)  

3. Call Super Constructor

Java Code

public class Foo() extends SuperFoo {  
   public Foo(Bar bar) {   
      super(bar);  
   }  
}  

Scala Code

class Foo(bar:Bar) extends SuperFoo(bar) {}

4. Multiple Constructors

Java Code

public class Foo {  
    public Bar bar;  
    public Foo() {   
       this(new Bar());   
    }  
    public Foo(Bar bar) {  
       this. bar = bar;   
    }  
}  

Scala Code

class Foo(val bar:Bar){  
    def this() = this(new Bar)  
}

5. Methods of getter and setter

Java Code

public class Foo() {  
   private Bar bar;  
   public Foo(Bar bar) {  
       this.bar = bar;  
   } 
   public Bar getBar() {   
      return bar;   
   }  
   public void setBar(Bar bar) {   
      this.bar = bar;  
   }  
}  

Scala Code

import scala.reflect._  
class Foo(@BeanProperty var bar:Bar)  

Scala Code (Other Way)

import scala.reflect._  
class Foo(aBar:Bar) {  
    @BeanProperty  
    private var bar = aBar  
}