One month with Kotlin: class fields example

classFieldsExample.java

// Using Class Fields on Kotlin

public class Foo(var variable: String, val value: String, val withDefault: String = "o") {
}

// And use it on Kotlin
Foo("f", "o", "o")
Foo("f", "o")

//------------------------------------------------------------------------------
 
// Using Class Fields in Java 7
public class Foo {

  private String variable;
  private final String value;
  private final String withDefault;
  
  Foo(String variable, String value, String withDefault) {
    this.variable = variable;
    this.value = value;
    this.withDefault = withDefault;
  }
  
  Foo(String variable, String value) {
    this.variable = variable;
    this.value = value;
    this.withDefault = "o";
  }

}

// And use it in Java 7
new Foo("f", "o", "o")
new Foo("f", "o")