stringswap.java

java 完全探索的随书源码

public class StringSwap {

  public static void swap( StringHolder s1, StringHolder s2 ) {
    // swap two strings wrapped using a holder class
    String temp = s1.myString;
    s1.myString = s2.myString;
    s2.myString = temp;
  }

  public static void main( String args[] ) {
    StringHolder s1 = new StringHolder();
    StringHolder s2 = new StringHolder();
    s1.myString = "First String";
    s2.myString = "Second String";
    swap(s1, s2);
    // the string object references are now swapped
    System.out.println("After the swap");
    System.out.println("s1 is " + s1.myString);
    System.out.println("s2 is " + s2.myString);
  }

  static class StringHolder {
    public String myString;
  }
}