set1.java

Java编程思想 第九课 全源码

//: c09:Set1.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Things you can do with Sets.
import java.util.*;
import com.bruceeckel.util.*;

public class Set1 {
  static Collections2.StringGenerator gen = 
    Collections2.countries;
  public static void testVisual(Set a) {//重复
    Collections2.fill(a, gen.reset(), 5);    
    Collections2.fill(a, gen.reset(), 5);    
    Collections2.fill(a, gen.reset(), 5);    
    System.out.println(a); // No duplicates!
    // Add another set to this one:
    a.addAll(a);
    a.add("one"); 
    a.add("one"); 
    a.add("one");
    System.out.println(a);
    // Look something up:
    System.out.println("a.contains(\"one\"): " +
      a.contains("one"));
  }
  public static void main(String[] args) {
    System.out.println("HashSet");
    testVisual(new HashSet());
    System.out.println("TreeSet");
    testVisual(new TreeSet());
  }
} ///:~