题目考查的是`StringBuffer`类的`reverse()`方法的作用。以下是对各选项的逐项分析:- **A. 字符串的赋值**:`reverse()`方法的作用是将字符串内容反转,而非赋值操作。赋值通常通过构造函数或`append()`实现,与`reverse()`无关,故此选项错误。- **B. 字符串清空**:清空字符串常用`setLength(0)`或`delete...
On Crunchify, we have published more than 500 Java Tutorials and in this tutorial we will go over steps on how to reverse a string in Java? There are 7
方式一: StringBuffer sb = new StringBuffer(); sb.append("我是中国人"); System.out.println("反转后:"+sb.reverse()); 1. 2. 3. 方式二: String str="我是中国人"; char[] charArr = str.toCharArray(); System.out.print("反转后:"); for(int i = charArr.length;i>0;i--){ System...
Here, we will reverse the string using StringBuffer.reverse() method, consider the given program:import java.util.*; public class ReverseString { public static void main(String args[]) { //declare string object and assign string StringBuffer str= new StringBuffer("Hello World!"); //revers...
public class StringTest {public static void main(String[] args) {StringBuffer i = new StringBuffer("abc");String j = i.reverse().toString();
Java程序演示reverse()方法示例import java.lang.StringBuffer; public class StringBufferClass { public static void main(String[] args) { StringBuffer sb = new StringBuffer("Java is a programming language"); //使用reverse()它会反转sb对象的字符。
* 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * @param str string字符串 待判断的字符串 * @return bool布尔型 */ public boolean judge (String str) { String reverse = new StringBuffer(str).reverse().toString(); ...
说明 此方法反转调用该方法的 StringBuffer 对象的值。 令 n 为旧字符序列(即字符串缓冲区中包含的字符序列)的长度就在执行相反方法之前。然后,新字符序列中索引 k 处的字符等于旧字符序列
sb.reverse()就是用来把stringbuffer里面的字符串翻转。譬如你stringbuffer里面存放了abc,sb.reverse()===>bca sb.toString()就是返回该stringbuffer的字符串形式。直白点就是 StringBuffer sb = new StringBuffer("abc"); -sb:abc sb.reverse(); -->sb: cba sb.toString() --> sb: cba...
// Method to reverse a string in Java using `StringBuffer` public static String reverse(String str) { return new StringBuffer(str).reverse().toString(); } public static void main(String[] args) { String str = "Techie Delight"; // Note that string is immutable in Java str = reverse(...