stringcompare.java

《Java面向对象程序设计》例子源代码.轻松学习书本.

//StringCompare.java
import javax.swing.JOptionPane;
public class StringCompare {
   public static void main( String args[] ){
      String s1 = new String( "hello" ); 
      String s2 = "goodbye";
      String s3 = "Happy Birthday";
      String s4 = "happy birthday";
      String output = "s1 = " + s1 + "\ns2 = " + s2 + "\ns3 = " + s3 + 
         "\ns4 = " + s4 + "\n";
      if ( s1.equals( "hello" ) )  	//调用String类的equals方法判断字符串是否相等
         output += "s1 equals \"hello\"\n";
      else
         output += "s1 does not equal \"hello\"\n"; 
      //调用String类的equalsIgnoreCase方法
      //在不区分大小写的情况下判断两字符串是否相等
      if ( s3.equalsIgnoreCase( s4 ) ) 	
         output += "s3 equals s4\n";
      else
         output += "s3 does not equal s4\n";
	  //调用String类的compareTo方法进行两字符串的大小比较
      output += "s1.compareTo( s2 ) is " + s1.compareTo( s2 ) +
         "\ns2.compareTo( s1 ) is " + s2.compareTo( s1 ) +
         "\ns1.compareTo( s1 ) is " + s1.compareTo( s1 ) +
         "\ns3.compareTo( s4 ) is " + s3.compareTo( s4 ) +
         "\ns4.compareTo( s3 ) is " + s4.compareTo( s3 ) + "\n";
      JOptionPane.showMessageDialog( null, output,
         "字符串的比较", JOptionPane.INFORMATION_MESSAGE );
      System.exit( 0 );
   }
}