一.代码
package com. zhuo. operator;
import javax. swing. text. html. HTML;
public class Demo {
public static void main ( String[ ] args) {
StringBuilder stringBuilder1 = new StringBuilder ( ) ;
stringBuilder1. append ( "Welcome" ) ;
stringBuilder1. append ( " " ) ;
stringBuilder1. append ( "to" ) ;
stringBuilder1. append ( " " ) ;
stringBuilder1. append ( "Java" ) ;
System. out. println ( stringBuilder1. toString ( ) ) ;
System. out. println ( "=============" ) ;
stringBuilder1. insert ( 11 , "HTML and " ) ;
System. out. println ( stringBuilder1. toString ( ) ) ;
System. out. println ( "==============" ) ;
StringBuilder stringBuilder2 = new StringBuilder ( ) ;
stringBuilder2. append ( "Welcome to Java" ) ;
stringBuilder2. delete ( 8 , 11 ) ;
System. out. println ( stringBuilder2. toString ( ) ) ;
System. out. println ( "=============" ) ;
StringBuilder stringBuilder3 = new StringBuilder ( ) ;
stringBuilder3. append ( "Welcome to Java" ) ;
stringBuilder3. deleteCharAt ( 8 ) ;
System. out. println ( stringBuilder3. toString ( ) ) ;
System. out. println ( "==============" ) ;
StringBuilder stringBuilder4 = new StringBuilder ( ) ;
stringBuilder4. append ( "Welcome to Java" ) ;
stringBuilder4. reverse ( ) ;
System. out. println ( stringBuilder4. toString ( ) ) ;
System. out. println ( "================" ) ;
StringBuilder stringBuilder5 = new StringBuilder ( ) ;
stringBuilder5. append ( "Welcome to Java" ) ;
stringBuilder5. replace ( 11 , 15 , "HTML" ) ;
System. out. println ( stringBuilder5. toString ( ) ) ;
System. out. println ( "================" ) ;
StringBuilder stringBuilder6 = new StringBuilder ( ) ;
stringBuilder6. append ( "Welcome to Java" ) ;
stringBuilder6. setCharAt ( 0 , 'w' ) ;
System. out. println ( stringBuilder6. toString ( ) ) ;
}
}
二.结果实现
Welcome to Java
== == == == == == =
Welcome to HTML and Java
== == == == == == ==
Welcome Java
== == == == == == =
Welcome o Java
== == == == == == ==
avaJ ot emocleW
== == == == == == == ==
Welcome to HTML
== == == == == == == ==
welcome to Java
Process finished with exit code 0