matchstrings.java

Java2入门经典第四章源码

public class MatchStrings
{
  public static void main(String[] args)
  {
    String string1 = "Too many ";
    String string2 = "cooks";
    String string3 = "Too many cooks";

  // Make string1 and string3 refer to separate strings that are identical
    string1 += string2;

    // Display the contents of the strings
    System.out.println("Test 1");
    System.out.println("string3 is now: " + string3);
    System.out.println("string1 is now: " + string1);

    if(string1 == string3)                        // Now test for identity
      System.out.println("string1 == string3 is true." +
                         " string1 and string3 point to the same string");
    else
      System.out.println("string1 == string3 is false." +
                  " string1 and string3 do not point to the same string");

    // Now make string1 and string3 refer to the same string
    string3 = string1;

    // Display the contents of the strings
    System.out.println("\n\nTest 2");
    System.out.println("string3 is now: " + string3);
    System.out.println("string1 is now: " + string1);

    if(string1 == string3)     // Now test for identity
      System.out.println("string1 == string3 is true." +
                         " string1 and string3 point to the same string");
    else
      System.out.println("string1 == string3 is false." +
                  " string1 and string3 do not point to the same string");
  }
}