Java 7 Features with Example

Java 7 was launched on July 7, 2011 and was made available for developers on July 28, 2011. There are a lot of new features added in JDK 7. In this article we will review some of these new Java 7 features with examples.

Project Coin

Project Coin, a central part of Java 7, was described by Darcy [Joseph Darcy,Member of the Oracle Technical Staff] as "a suite of language and library changes to make things programmers do everyday easier".

coin, n. A piece of small change
coin, v. To create new language

Coin - Binary Literal

public class BinaryLiteral {
 public static void main(String[] args) {
  //Binary literal starts with 0b
  int binNum=0b01111110;
  System.out.println(binNum);  
 }
}

Coin - Underscores in Numeric Literals

public class LiteralIimprovement{
 public static void main(String[] args) {
  int intNum = 1_345;
  long longNum = 2_000_234;
  int binNum=0b011_111_10;
  int octNum = 012_74;
  int hexNum = 0x12_AD_EF;
  double tax = 1_458.456_45;

  System.out.println(intNum);
  System.out.println(longNum);
  System.out.println(binNum);  
  System.out.println(octNum);
  System.out.println(hexNum);
  System.out.println(tax);
 }
}

Coin - String in Switch

public class StringSwitchExample {

 public static void seasonSelector(String season) {
  season = season.toLowerCase();
  switch (season) {
  case "winter":
   System.out.println("It is " + season);
   break;
  case "spring":
   System.out.println("It is " + season);
   break;
  case "autumn":
   System.out.println("It is " + season);
   break;
  case "summer":
   System.out.println("It is " + season);
   break;
  default:
   System.out.println("Invalid input");
  }
 }
 public static void main(String[] args) {
  seasonSelector("spring");
  seasonSelector("Winter");

 }
}