stringreferences.java

Java程序设计技巧与开发实例附书源代码。

public class StringReferences {
  public static void main(String args[]) {
    String s1 = "武昌珞珈山";
    String s2 = new String("武昌珞珈山");
    String s3 = s2;
    String s4 = "武昌 " + new String("珞珈山");
    System.out.println("s1 == s2: " + (s1 == s2));
    System.out.println("s1 == s3: " + (s1 == s3));
    System.out.println("s1 == s4: " + (s1 == s4));
    System.out.println("s2 == s3: " + (s2 == s3));
    System.out.println("s2 == s4: " + (s2 == s4));
    System.out.println("s3 == s4: " + (s3 == s4));
  }
}