Examples to explain common methods of StringBuffer class

Use the StringBuffer class to process strings

The StringBuffer class is a reference data type that stores strings more efficiently than the String class.

(Recommended tutorial: java introductory tutorial)

Common methods of the StringBuffer class

(1) Declare the StringBuffer object and initialize

StringBuffer sb=new StringBuffer("青春飞扬！");

(2) toString() method: converted to String type

String s=sb.toString();

(3) append() method: append string

字符串.append(参数);

(4) insert() method: insert string

字符串.insert(位置，参数);

(Video tutorial recommendation: java video tutorial)

Code example:

Common methods for practical application of StringBuffer class

public static void main(String[] args) {
        StringBuffer sb=new StringBuffer("青春无悔");
        int num=110;
        //在字符串后面追加字符串
        StringBuffer sb1=sb.append("我心永恒！");
        System.out.println(sb1);
        //在字符串后面追加整型数字
        StringBuffer sb2=sb1.append(520);
        System.out.println(sb2);
        //在指定位置插入逗号
        StringBuffer sb3=sb2.insert(4,",");
        System.out.println(sb3);
    }

Output result:

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