Java 14 has promoted Java 12 and Java 13 switch improvements to standard feature.

Examples

Switch Statement

package com.logicbig.example;

import java.time.LocalDate;
import java.time.Month;

public class SwitchStatementExample {
  public static void main(String[] args) {
      showQuarter(LocalDate.now().getMonth());
  }

  public static void showQuarter(Month month) {
      switch (month) {
          case JANUARY, FEBRUARY, MARCH -> System.out.println("First Quarter");//no break needed
          case APRIL, MAY, JUNE -> System.out.println("Second Quarter");
          case JULY, AUGUST, SEPTEMBER -> System.out.println("Third Quarter");
          case OCTOBER, NOVEMBER, DECEMBER -> System.out.println("Forth Quarter");
          default -> System.out.println("Unknown Quarter");
      }
  }
}

First Quarter

Switch Expression

package com.logicbig.example;

import java.time.LocalDate;
import java.time.Month;

public class SwitchExpressionExample {
  public static void main(String[] args) {
      showQuarter(LocalDate.now().getMonth());
  }

  public static void showQuarter(Month month) {
      String quarter = switch (month) {
          case JANUARY, FEBRUARY, MARCH -> "First Quarter"; //must be a single returning value
          case APRIL, MAY, JUNE -> "Second Quarter";
          case JULY, AUGUST, SEPTEMBER -> "Third Quarter";
          case OCTOBER, NOVEMBER, DECEMBER -> "Forth Quarter";
          default -> "Unknown Quarter";
      };
      System.out.println(quarter);
  }
}

First Quarter

Switch Expression with yield

In last switch expression example a single expression to the right of the "case L ->" switch label was used. If a full block is needed, new keyword yield can be used as shown.

package com.logicbig.example;

import java.time.LocalDate;
import java.time.Month;

public class SwitchExpressionWithYieldAndArrow {
  public static void main(String[] args) {
      showQuarter(LocalDate.now().getMonth());
  }

  public static void showQuarter(Month month) {

      String result = switch (month) {
          case JANUARY,
                  FEBRUARY,
                  MARCH -> {
              //multiple statements can be used here
              yield "First Quarter";
          }
          case APRIL, MAY, JUNE -> {
              //multiple statements can be used here
              yield "Second Quarter";
          }
          case JULY, AUGUST, SEPTEMBER -> "Third Quarter";
          case OCTOBER, NOVEMBER, DECEMBER -> {
              //multiple statements can be used here
              yield "Forth Quarter";
          }
          default -> "Unknown Quarter";
      };
      System.out.println(result);
  }
}

First Quarter

Using yield with traditional switch block

A switch expression can, like a switch statement, also use a traditional switch block:

package com.logicbig.example;

import java.time.LocalDate;
import java.time.Month;

public class SwitchExpressionWithYield {
  public static void main(String[] args) {
      showQuarter(LocalDate.now().getMonth());
  }

  public static void showQuarter(Month month) {

      String result = switch (month) {
          case JANUARY:
          case FEBRUARY:
          case MARCH:
              //multiple statements can be used here
              yield "First Quarter";
          case APRIL:
          case MAY:
          case JUNE:
              //multiple statements can be used here
              yield "Second Quarter";
          case JULY:
          case AUGUST:
          case SEPTEMBER:
              //multiple statements can be used here
              yield "Third Quarter";
          case OCTOBER:
          case NOVEMBER:
          case DECEMBER:
              //multiple statements can be used here
              yield "Forth Quarter";
          default:
              yield "Unknown Quarter";
      };
      System.out.println(result);
  }
}

First Quarter

Example Project

Dependencies and Technologies Used:

• JDK 14