holder3.java

来自「java编程思想(第四版)书中原代码 ,对初学者很有用的东西」· Java 代码 · 共 16 行

//: generics/Holder3.java

public class Holder3<T> {
  private T a;
  public Holder3(T a) { this.a = a; }
  public void set(T a) { this.a = a; }
  public T get() { return a; }
  public static void main(String[] args) {
    Holder3<Automobile> h3 =
      new Holder3<Automobile>(new Automobile());
    Automobile a = h3.get(); // No cast needed
    // h3.set("Not an Automobile"); // Error
    // h3.set(1); // Error
  }
} ///:~