StringMisc

//StringMisc.java

// This program demonstrates the length, charAt and getChars

// methods of the String class.

// Note: Method getChars requires a starting point

// and ending point in the String. The starting point is the

// actual subscript from which copying starts. The ending point

// is one past the subscript at which the copying ends.

import javax.swing.*;

public class StringMisc {

public static void main( String args[] )

{

String s1, output;

char charArray[];

s1 = new String( "hello there" );

charArray = new char[ 5 ];

// output the string

output = "s1: " + s1;

// test the length method

output += "\nLength of s1: " + s1.length();

// loop through the characters in s1 and display reversed

output += "\nThe string reversed is: ";

for ( int i = s1.length() - 1; i >= 0; i-- )

output += s1.charAt( i ) + " ";

// copy characters from string into char array

//四个参数的含义

//1.被拷贝字符在字串中的起始位置

//2.被拷贝的最后一个字符在字串中的下标再加1

//3.目标字符数组

//4.拷贝的字符放在字符数组中的起始下标

s1.getChars( 0, 5, charArray, 0 );

output += "\nThe character array is: ";

for ( int i = 0; i < charArray.length;i++ )

output += charArray[ i ];

JOptionPane.showMessageDialog( null, output,

"Demonstrating String Class Constructors",

JOptionPane.INFORMATION_MESSAGE );

System.exit( 0 );

}

巴特西