Javaの文字列の一般的な方法

/**
 * 
 */
package com.you.model;

/**
 * @author Administrator
 * @date 2014-02-24
 */
public class Replace {

	/**
	 * @param args
	 */
	public static void main(String[] args) 
	{
		/**
		 *     
		 */
		String str = "78454545855ksdjnf dnfdksf klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>";
		
		/**
		 * concat()
		 */
		str = str.concat(str);
		System.out.println("   concat()：" + str);
		System.out.println();
		
		/**
		 * intern()
		 */
		str = str.intern();
	    System.out.println("   intern():" + str);
	    System.out.println();
	    
	    /**
		 * replace("","")
		 */
	    str = str.replace("8", "  ");
	    System.out.println("   replace('',''):" + str);
	    System.out.println();
	    
	    /**
		 * replaceAll("","")
		 */
	    str = str.replaceAll("f", "    ");
	    System.out.println("   replaceAll('',''):" + str);
	    System.out.println();
	    
	    /**
		 * replaceFirst("","")
		 */
	    str = str.replaceFirst("7", "      ");
	    System.out.println("   replaceFirst('','')：" + str);
	    System.out.println();
	    
	    /**
	     * substring()
	     */
	    str = str.substring(20);
	    System.out.println("   substring()：" + str);
	    System.out.println();
	    
	    /**
	     * substring(, )
	     */
	    str = str.substring(25, 35);
	    System.out.println("   substring(0,10)：" + str);
	    System.out.println();
	    
	    /**
	     * toLowerCase()
	     */
	    str = str.toLowerCase();
	    System.out.println("   toLowerCase()：" + str);
	    System.out.println();
	    
	    /**
	     * toUpperCase()
	     */
	    str = str.toUpperCase();
	    System.out.println("   toUpperCase()：" + str);
	    System.out.println();
	    
	    /**
	     * trim()
	     */
	    str = str.trim();
	    System.out.println("   trim()：" + str);
	    System.out.println();
	    
	    /**
	     * length()
	     */
	    int len = str.length();
	    System.out.println("    length()：" + len);
	}

}

   concat()：78454545855ksdjnf dnfdksf klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>78454545855ksdjnf dnfdksf klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>


   intern():78454545855ksdjnf dnfdksf klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>78454545855ksdjnf dnfdksf klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>


   replace('',''):7  454545  55ksdjnf dnfdksf klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>7  454545  55ksdjnf dnfdksf klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>


   replaceAll('',''):7  454545  55ksdjn     dn    dks     klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>7  454545  55ksdjn     dn    dks     klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>


   replaceFirst('','')：        454545  55ksdjn     dn    dks     klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>7  454545  55ksdjn     dn    dks     klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>


   substring()：djn     dn    dks     klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>7  454545  55ksdjn     dn    dks     klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>


   substring(0,10)：ADE TGTH e


   toLowerCase()：ade tgth e


   toUpperCase()：ADE TGTH E


   trim()：ADE TGTH E


    length()：10