Java API:String class 一、介绍 本博文参照API文档以及源码进行阅读,源码参考JDK1.8。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 java.lang.String public final class String extends Object implements Serializable, Comparable<String>, CharSequence JDK1.0出现。 上面由API提供的描述,可以看出,String是一...
importjava.util.Scanner;publicclassStringToClassExample{publicstaticvoidmain(String[]args){// 步骤一:获取类名的字符串Scannerscanner=newScanner(System.in);System.out.print("请输入类名:");StringclassName=scanner.nextLine();// 步骤二:调用ClassLoader的loadClass()方法Class<?>clazz=null;try{clazz=Clas...
随着JDK 版本的迭代,String类的底层设计和优化不断改进,以适应不同的使用场景和提高性能。从 JDK 6 的永久代常量池,到 JDK 7 的堆内存常量池,再到 JDK 8 的元空间和intern()方法的优化,以及 JDK 9 的内存占用优化,Java 的String类一直在进化。这些改进不仅提高了性能,还减少了内存占用,使得 Java 程序更加高...
importjava.util.Scanner;publicclassMain{publicstaticvoidmain(String[]args){// 创建一个Scanner对象Scannerscanner=newScanner(System.in);// 使用Scanner对象读取字符串输入System.out.print("请输入一个字符串:");Stringinput=scanner.nextLine();// 处理输入的字符串System.out.println("你输入的字符串是:"+i...
在Java 8 之前,我们常使用Date来表示日期与时间。设计Date与String互转的工具类时,只要借助一下SimpleDateFormat,即可轻松的实现。 示例代码如下: import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class DateUtil { ...
1. class Student {2. public String name;3. public int age;4.5. public Student(String name, int age) {6. this.name = name;7. this.age = age;8. }9.10. public String toString() {11. return "name:" + name + " age:" + age;12. }13. }14. public static void main(String[] ...
1importjava.util.Scanner;23//键盘录入一串字符,将字符中大写转化成小写,将小写转化为大写,数字以*来代替4publicclasstest04 {5publicstaticvoidmain(String[] args) {6//实例化Scanner7Scanner input =newScanner(System.in);8System.out.println("请输入一串字符");910String s =input.next();11//将字符串...
sb.insert(8, "Java"); System.out.println(sb); sb.delete(5,8); System.out.println(sb); } 运行结果为: Runoob.. Runoob..! Runoob..Java! RunooJava! 而如果我们要求线程安全的话,就必须使用StringBuffer类了 public class Test{ public static void main(String args[]){ ...
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 ...
The String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class. Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable...