24_API_StringBuilder

 

 1.概念

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 2.与String的区别

 

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 3.构造方法

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 4.成员方法

 

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 5.与String转换

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 6.StringBulider代码案例

package JavaBasicReview;

public class JavaGrammer {
    
    public static void main(String[] args) {
        /*使用场景：当需要对字符串进行修改、增添、删除操作时，建议使用此对象。*/
        StringBuilder stringBuilder = new StringBuilder("abcdefghigklmn");
        //append,追加元素
        stringBuilder.append("99999");
        //delete，删除指定范围内的元素[start,end]
        stringBuilder.delete(1,4);
        //将String2StringBuilder，构造方法、append
        String str = "string";
        StringBuilder sb = new StringBuilder(str);
        //将Stringbuilder2String
        String str1 = stringBuilder.toString();
        System.out.println(str1);
    }
}