String and StringBuffer in java difference of

String

• String class object is immutable once created .
• String object unmodifiable Unicode encoding strings.
• Java double quotes is also used as a String object string.

E.g:

System.out.println("abc".length()); // 输出3

StringBuffer

• Content StringBuffer object can be changed .
• If you frequently modify the content of the string, use the StringBuffer.
• If you often String object string modify the content, it would lead to that is time-consuming and space consuming.
• Numerous modifications StringBuffer class has strings.

Create a StringBuffer string object:

StringBuffer stringBuffer = new StringBuffer("abc");
stringBuffer.append("d"); // 字符串末尾附加d
System.out.println(stringBuffer); // 输出：abcd