tupletest.java

《Thinking in Java 4th Edition》 Source Code

//: generics/TupleTest.java
import net.mindview.util.*;

class Amphibian {}
class Vehicle {}

public class TupleTest {
  static TwoTuple<String,Integer> f() {
    // Autoboxing converts the int to Integer:
    return new TwoTuple<String,Integer>("hi", 47);
  }
  static ThreeTuple<Amphibian,String,Integer> g() {
    return new ThreeTuple<Amphibian, String, Integer>(
      new Amphibian(), "hi", 47);
  }
  static
  FourTuple<Vehicle,Amphibian,String,Integer> h() {
    return
      new FourTuple<Vehicle,Amphibian,String,Integer>(
        new Vehicle(), new Amphibian(), "hi", 47);
  }
  static
  FiveTuple<Vehicle,Amphibian,String,Integer,Double> k() {
    return new
      FiveTuple<Vehicle,Amphibian,String,Integer,Double>(
        new Vehicle(), new Amphibian(), "hi", 47, 11.1);
  }
  public static void main(String[] args) {
    TwoTuple<String,Integer> ttsi = f();
    System.out.println(ttsi);
    // ttsi.first = "there"; // Compile error: final
    System.out.println(g());
    System.out.println(h());
    System.out.println(k());
  }
} /* Output: (80% match)
(hi, 47)
(Amphibian@1f6a7b9, hi, 47)
(Vehicle@35ce36, Amphibian@757aef, hi, 47)
(Vehicle@9cab16, Amphibian@1a46e30, hi, 47, 11.1)
*///:~