If such synchronization is required then it is recommended that java.lang.StringBuffer be used. Unless otherwise noted, passing a null argument to a constructor or method in this class will cause a NullPointerException to be thrown. Added in 1.5....
package com.model.stringbuffer; import java.util.Scanner; /** * @Description:测试类 * @Author: 张紫韩 * @Crete 2021/7/4 19:25 * 演示StringBuffer类的练习题 */ public class StringBufferDemo04 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); Double...
1. StringBuilder stringBuilder = new StringBuilder(); 创建一个可变长字符数组,但是这个字符数组对象是由默认长度的,源码如下: publicfinalclassStringBuilderextendsAbstractStringBuilderimplementsjava.io.Serializable, CharSequence {/** * Constructs a string builder with no characters in it and an * initial capa...
public class StringBuilderTest02 {public static void main(String[] args) {//键盘录入一个字符串,用 Scanner 实现Scanner sc = new Scanner(System.in);System.out.println("请输入一个字符串:");String line = sc.nextLine();//调用方法,用一个变量接收结果String s = myReverse(line);//输出结果Syste...
想要了解一个类,最好的办法就是看这个类的实现源代码,String类的实现在\jdk1.6.0_14\src\java\lang\String.java 文件中。 打开这个类文件就会发现String类是被final修饰的: public final class String implements java.io.Serializable, Comparable<String>, CharSequence { /** The value is used for character...
Returns a string representing the data in this sequence. void trimToSize() Attempts to reduce storage used for the character sequence. Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait Methods inherited from interface ...
publicclass 统计输入字符串中各种字符的个数 {publicstaticvoidmain(String[] args){Scannersc=newScanner(System.in); System.out.println("请输入一个字符串:");Stringnext=sc.next();intaa=0;//大写字母intbb=0;//小写字母intcc=0;//数字intdd=0;//其他char[] chars = next.toCharArray();for(inti...
public class StringDemo { public static void main(String[] args) { String palindrome = "Dot saw I was Tod"; int len = palindrome.length(); char[] tempCharArray = new char[len]; char[] charArray = new char[len]; // put original string in an // array of chars for (int i = ...
publicfinalclassStringBufferextendsAbstractStringBuilderimplementsjava.io.Serializable,CharSequence{...} StringBuilder类被final所修饰,因此不能被继承。 StringBuilder类继承于AbstractStringBuilder类。实际上,AbstractStringBuilder类具体实现了可变字符序列的一系列操作,比如:append()、insert()、delete()、replace()、charAt...
voidtrimToSize() 尝试减少用于字符序列的存储空间。 声明方法的类 java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait 声明方法的接口 java.lang.CharSequence charAt, chars, codePoints, length, subSequence, toString构造...