hide.java

来自「think in java TIJ-3rd-edition-code.zip」· Java 代码 · 共 39 行

//: c06:Hide.java
// Overloading a base-class method name
// in a derived class does not hide the
// base-class versions.
import com.bruceeckel.simpletest.*;

class Homer {
  char doh(char c) {
    System.out.println("doh(char)");
    return 'd';
  }
  float doh(float f) {
    System.out.println("doh(float)");
    return 1.0f;
  }
}

class Milhouse {}

class Bart extends Homer {
  void doh(Milhouse m) {}
}

public class Hide {
  public static void main(String[] args) {
    SimpleTest monitor =
      new SimpleTest("Hide");
    Bart b = new Bart();
    b.doh(1); // doh(float) used
    b.doh('x');
    b.doh(1.0f);
    b.doh(new Milhouse());
    monitor.expect(new String[] {
      "doh(float)",
      "doh(char)",
      "doh(float)"
    });
  }
} ///:~