stringindexmethods.java

来自「《Java面向对象程序设计》例子源代码.轻松学习书本.」· Java 代码 · 共 36 行

//StringIndexMethods.java
import javax.swing.*;
public class StringIndexMethods {
   public static void main( String args[] ){
      String letters = "abcdefghabcdefgh";
      //调用String类的indexOf方法定位某个字符在字符串中第一次出现的位置
      String output = "'c' is located at index " + letters.indexOf( 'c' );
      output += "\n'a' is located at index " + letters.indexOf( 'a', 1 );
      output += "\n'$' is located at index " + letters.indexOf( '$' );
      //调用lastIndexOf方法定位某个字符在字符串中最后一次出现的位置
      output += "\nLast 'c' is located at index " +
         letters.lastIndexOf( 'c' );
      output += "\nLast 'a' is located at index " +
         letters.lastIndexOf( 'a', 10 );
      output += "\nLast '$' is located at index " +
         letters.lastIndexOf( '$' );
      //调用indexOf方法定位某个子字符串在字符串中第一次出现的位置
      output += "\n\"def\" is located at index " +
         letters.indexOf( "def" );
      output += "\n\"def\" is located at index " +
         letters.indexOf( "def", 7 );
      output += "\n\"hello\" is located at index " +
         letters.indexOf( "hello" );
      //调用lastIndexOf方法定位某个子字符在字符串中最后一次出现的位置
      output += "\nLast \"def\" is located at index " +
         letters.lastIndexOf( "def" );
      output += "\nLast \"def\" is located at index " +
         letters.lastIndexOf( "def", 25 );
      output += "\nLast \"hello\" is located at index " +
         letters.lastIndexOf( "hello" );
      JOptionPane.showMessageDialog( null, output,
         "字符串检索", JOptionPane.INFORMATION_MESSAGE );
      System.exit( 0 );
   }
}