demotion.java

Java编程思想 第四课 全代码

//: c04:Demotion.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Demotion of primitives and overloading.

public class Demotion {
  static void prt(String s) { 
    System.out.println(s); 
  }

  void f1(char x) { prt("f1(char)"); }
  void f1(byte x) { prt("f1(byte)"); }
  void f1(short x) { prt("f1(short)"); }
  void f1(int x) { prt("f1(int)"); }
  void f1(long x) { prt("f1(long)"); }
  void f1(float x) { prt("f1(float)"); }
  void f1(double x) { prt("f1(double)"); }

  void f2(char x) { prt("f2(char)"); }
  void f2(byte x) { prt("f2(byte)"); }
  void f2(short x) { prt("f2(short)"); }
  void f2(int x) { prt("f2(int)"); }
  void f2(long x) { prt("f2(long)"); }
  void f2(float x) { prt("f2(float)"); }

  void f3(char x) { prt("f3(char)"); }
  void f3(byte x) { prt("f3(byte)"); }
  void f3(short x) { prt("f3(short)"); }
  void f3(int x) { prt("f3(int)"); }
  void f3(long x) { prt("f3(long)"); }

  void f4(char x) { prt("f4(char)"); }
  void f4(byte x) { prt("f4(byte)"); }
  void f4(short x) { prt("f4(short)"); }
  void f4(int x) { prt("f4(int)"); }

  void f5(char x) { prt("f5(char)"); }
  void f5(byte x) { prt("f5(byte)"); }
  void f5(short x) { prt("f5(short)"); }

  void f6(char x) { prt("f6(char)"); }
  void f6(byte x) { prt("f6(byte)"); }

  void f7(char x) { prt("f7(char)"); }

  void testDouble() {
    double x = 0;
    prt("double argument:");
    f1(x);f2((float)x);f3((long)x);f4((int)x);
    f5((short)x);f6((byte)x);f7((char)x);
  }
  public static void main(String[] args) {
    Demotion p = new Demotion();
    p.testDouble();
  }
} ///:~