swapattempt.java

来自「java 完全探索的随书源码」· Java 代码 · 共 21 行

public class SwapAttempt {

  public static void swap( String s1, String s2 ) {
    // these statements are legal but they have no
    // effect on the variables in the calling method
    String temp = s1;
    s1 = s2;
    s2 = temp;
  }

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