题目

代码

public class Test27_MyStringBuilder1 {String sb;// 有参构造（传入String）public Test27_MyStringBuilder1(String s){sb = s;}// 有参构造（传入StringBuilder）public Test27_MyStringBuilder1(StringBuilder s){sb = s.substring(0);}// 追加元素（字符串）public Test27_MyStringBuilder1 append(Test27_MyStringBuilder1 s){sb += s.sb;return new Test27_MyStringBuilder1(sb);}// 追加数字public Test27_MyStringBuilder1 append(int i){sb += i;return new Test27_MyStringBuilder1(sb);}// 返回长度public int length(){return sb.length();}// 返回下标元素public char charAt(int index){return sb.charAt(index);}// 大写转小写public Test27_MyStringBuilder1 toLowerCase(){int toASCII = 0;for (int i = 0 ; i < sb.length() ; i++){toASCII = (int) sb.charAt(i);if (toASCII >= 65 && toASCII <= 90){toASCII += 33;sb.replace(sb.charAt(i), (char) toASCII);}}return new Test27_MyStringBuilder1(sb);}// 截取public Test27_MyStringBuilder1 substring(int begin, int end){return new Test27_MyStringBuilder1(sb.substring(begin, end));}// 转字符串public String toString(){return sb.toString();}
}

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