Some common methods for sharing strings in Java

1. Some common methods of strings in Java

package com.you.model;

public class Replace {
 
 public static void main(String[] args) 
 {
  
  String str = "78454545855ksdjnf dnfdksf klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>";

  
  str = str.concat(str);
  System.out.println(" For the first time, concat() : " + str);
  System.out.println();

  
  str = str.intern();
     System.out.println(" The second time intern():" + str);
     System.out.println();

     
     str = str.replace("8", " Make a fortune ");
     System.out.println(" The third time replace('',''):" + str);
     System.out.println();

     
     str = str.replaceAll("f", " amitabha ");
     System.out.println(" For the fourth time replaceAll('',''):" + str);
     System.out.println();

     
     str = str.replaceFirst("7", " Seventy-seven forty-nine days ");
     System.out.println(" The fifth time replaceFirst('','') : " + str);
     System.out.println();

     
     str = str.substring(20);
     System.out.println(" The sixth time substring() : " + str);
     System.out.println();

     
     str = str.substring(25, 35);
     System.out.println(" The seventh time substring(0,10) : " + str);
     System.out.println();

     
     str = str.toLowerCase();
     System.out.println(" The eighth toLowerCase() : " + str);
     System.out.println();

     
     str = str.toUpperCase();
     System.out.println(" The ninth toUpperCase() : " + str);
     System.out.println();

     
     str = str.trim();
     System.out.println(" The tenth trim() : " + str);
     System.out.println();

     
     int len = str.length();
     System.out.println(" The 11th length() : " + len);
 }
}

2, the results

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

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

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

 For the fourth time replaceAll('',''):7 Make a fortune 454545 Make a fortune 55ksdjn amitabha  dn amitabha dks amitabha  klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>7 Make a fortune 454545 Make a fortune 55ksdjn amitabha  dn amitabha dks amitabha  klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>

 The fifth time replaceFirst('','') : seventy-seven forty-nine days to make a fortune 454545 Make a fortune 55ksdjn amitabha  dn amitabha dks amitabha  klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>7 Make a fortune 454545 Make a fortune 55ksdjn amitabha  dn amitabha dks amitabha  klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>

 The sixth time substring() : djn amitabha  dn amitabha dks amitabha  klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>7 Make a fortune 454545 Make a fortune 55ksdjn amitabha  dn amitabha dks amitabha  klkADE TGTH eiru oaK L!@@$#%$^*&(*()()><?<>>>

 The seventh time substring(0,10) : ADE TGTH e

 The eighth toLowerCase() : ade tgth e

 The ninth toUpperCase() : ADE TGTH E

 The tenth trim() : ADE TGTH E

 The 11th length() : 10