JavaTuples - Unit Class-alljchome-开发者的教程家园

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JavaTuples - Unit Class

Introduction

The org.javatuples.Unit class represents a Tuple with single element.

Class declaration

Following is the declaration for org.javatuples.Unit class −

pubpc final class Unit<A>
   extends Tuple
      implements IValue0<A>

Class constructors

Sr.No.	Constructor & Description
1	Unit(A value0) This creates a Unit Tuple.

Class Methods

Sr.No.	Method & Description
1	Pair add(Unit tuple) This method returns a Pair tuple. Similarly other methods to add tuples are available e.g. add(Pair tuple) returns Triplet and upto add(Ennead tuple) returns Decade tuple.
2	Pair add(X0 value) This method add a value to the tuple and returns a Pair tuple. Similarly other methods to add values are available e.g. add(X0 value0, X1 value1) returns Triplet and so on upto add() with nine parameters.
3	Pair addAt0(Unit value) This method add a Unit tuple at index 0 and returns a Pair tuple. Similarly other methods to add tuples are available e.g. addAt0(Pair value) returns Triplet and so on upto addAt0(Ennead). Other similar method are addAt1(Unit value) which add a unit at index0 and have similar methods upto addAt1(Ennead).
4	Pair addAt0(X0 value) This method add a value at index 0 and returns a Pair tuple. Similarly other methods to add values are available e.g. addAt0(X0 value0, X1 value1) returns Triplet and so on upto addAt0() with nine parameters. Other similar method are addAt1(X0 value) which add a value at index0 and have similar methods upto addAt1() with nine parameters.
5	static <X> Unit<X> fromArray(X[] array) Create tuple from array.
6	static <X> Unit<X> fromCollection(Collection<X> collection) Create tuple from collection.
7	static <X> Unit<X> fromIterable(Iterable<X> iterable) Create tuple from iterable.
8	static <X> Unit<X> fromIterable(Iterable<X> iterable, int index) Create tuple from iterable, starting from the specified index.
9	int getSize() Return the size of the tuple.
10	A getValue0() Return the value of the tuple.
11	<X> Unit<X> setAt0(X value) Set the value of the tuple.
12	static <A> Unit<A> with(A value0) Create the tuple using given value.

Methods inherits

This class inherits methods from the following classes −

org.javatuples.Tuple

Object

Example

Let s see Unit Class in action. Here we ll see how to use various methods.

Create a java class file named TupleTester in C:>JavaTuples.

File: TupleTester.java

package com.tutorialspoint;
import java.util.ArrayList;
import java.util.List;
import org.javatuples.Pair;
import org.javatuples.Unit;
pubpc class TupleTester {
   pubpc static void main(String args[]){
      Unit<Integer> unit = Unit.with(5);
      System.out.println(unit);
      boolean isPresent = unit.contains(5);
      System.out.println("5 is present: " + isPresent);
      List<Integer> pst = new ArrayList<>();
      pst.add(1);
      Pair<Integer, String> pair = unit.add("Test");
      System.out.println(pair);
      Integer value = unit.getValue0();
      System.out.println(value);
      Unit<Integer> unit1 = Unit.fromCollection(pst);   
      System.out.println(unit1);
   }
}

Verify the result

Compile the classes using javac compiler as follows −

C:JavaTuples>javac -cp javatuples-1.2.jar ./com/tutorialspoint/TupleTester.java

Now run the TupleTester to see the result −

C:JavaTuples>java  -cp .;javatuples-1.2.jar com.tutorialspoint.TupleTester

Output

Verify the Output

[5]
5 is present: true
[5, Test]
5
[1]