publicclassDemo02{publicstaticvoidmain(String[] args){StringBuffer sb =newStringBuffer();String user ="yyg";String pwd ="123";//实现SQL语句的拼接 sb.append("select * from userInfo where username=").append(user).append(" and pwd=").append(pwd);System.out.println("sql="+sb.toString()...
StringBuffer sb=newStringBuffer("Hello");sb.insert(2,"Java");// 在位置2插入 "Java"System.out.println(sb.toString());// 输出 "HeJavallo" 删除字符串 delete方法用于删除指定范围内的字符: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
* A thread-safe, mutable sequence of characters.*A string buffer is like a {@link String}, but can be modified.*The principal operations on a {@code StringBuffer} are the*{@code append} and {@code insert} methods, which are*overloaded so as to accept data of any type.*Whenever an ...
每个StringBuffer的类对象都能够存储指定容量的字符串,如果字符串的长度超过了StringBuffer对象的容量空间,则该对象的容量会自动扩大。 另外我们在使用StringBuffer类时,比如每次调用toString()方法,都会直接使用缓存区的toStringCache 值来构造一个字符串,这每次都是对StringBuffer对象本身进行操作,而不会重新生成一个新对...
publicclassDemo02 {publicstaticvoidmain(String[] args) {// 题目二:将字符串中,第一个字母转换成大写,其他字母转换成小写,并打印改变后的字符串。String s="ffAAADF"; String s1=s.substring(0,1); String s2=s.substring(1); String s3=s1.toUpperCase().concat(s2.toLowerCase()); ...
StringBuffer作为一个可变字符串类,具有如下特性: ●具有线程安全性:StringBuffer中的公开方法都由synchronized关键字修饰,保证了线程同步; ●带有缓冲区:StringBuffer每次调用toString()方法时,都会直接使用缓存区的toStringCache值来构造一个字符串; ●内容可变性:StringBuffer中带有字符串缓冲区,我们可以通过数组的复制来...
String str = "abcxyz"; System.out.println(str.compareToIgnoreCase("ABCXYZ")); //返回结果为true 1. 2. 5.str.concat(Sting anotherString)字符串拼接,与字符串连接运算符"+"功能相同 String str = "abcxyz"; System.out.println(str.concat("abc")); //输出结果为abcxyzabc ...
Appendable:An object to which char sequences and values can be appended. 数据结构 String final 型byte数组,不可修改性的源头。 StringBuffer、StringBuilder 在java.lang.AbstractStringBuilder中: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /** * The value is used for character storage. */ ...
public static void main(String[] args) { StringBuffer buff = new StringBuffer("Java lang package"); System.out.println("buffer = " + buff); // deleting characters from index 4 to index 9 buff.delete(4, 9); System.out.println("After deletion = " + buff); ...
Simplify conversion of DataBuffer to String… f17b012 rstoyanchevadded a commit that referenced this pull requestMar 26, 2020 Polishing contribution… 7aa06b8 rstoyanchevadded a commit that referenced this pull requestMar 26, 2020 Remove dumpString from DataBufferTestUtils… ...