Kotlin Blog post examples

Elvis.kt

return nullableString?.length ?: -1

NonNullable.kt

var s: String = "I Love Kotlin" 
s = null // compilation error, s can't be null

Nullable.java

if(nullableString != null) {
    return nullableString.length();
} else {
    return -1;
}

Nullable.kt

var nullableString: String? = "abc" 
nullableString = null // now this is not an error

User.java

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.lang.builder.ToStringBuilder;

public class User {

  private String name;
  private int age;
  public User(String name, int age) {
      this.name = name;
      this.age = age;
  }
  public String getName() {
      return name;
  }
  public void setName(String name) {
      this.name = name;
  }
  public int getAge() {
      return age;
  }
  public void setAge(int age) {
      this.age = age;
  }
  @Override
  public String toString() {
      return ToStringBuilder.reflectionToString(this);
  }
  @Override
  public int hashCode() {
       return new HashCodeBuilder()
             .append(name).append(age).toHashCode();
  }
  @Override
  public boolean equals(Object other) {
      if (other == this) {
          return true;
      }
      if ((other instanceof Example) == false) {
          return false;
      }
      Example rhs = ((Example) other);
      return new EqualsBuilder().append(name, rhs.name)
          .append(age, rhs.age).isEquals();
  }
}

User.kt

data class User(val name: String, val age: Int)