Java string字符串的相关内容

使用java中的String类操作复杂的字符串

今天自己出了一道题差点把自己难住…… 题目是这样的：已知有三条查询的sql语句，小明不小心写一块了，你帮他拆分开。sql语句为："select * from books where bid = 1 select * from cate where name = ‘java’ select titl...

36、Java 中的 String、StringBuilder、StringBuffer、字符串常量池和 intern 方法

一、String ✏️ Java 中用 java.lang.String 类代表字符串 ✏️ 底层用char[]存储字符数据。从 Java9 开始，底层使用 byte[]存储字符数据 ...

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java中两个String字符串比较去重

假设有两个字符串String qc1 = "张三,李四,赵二,谢大脚,刘能";String qc2 = "谢广坤,谢大脚,张三";如何去重，只留下qc2中不包含qc1中的字段呢，这时候要用到indexOf()； java.lang.String.indexOf(String str)indexOf(...

Java中String字符串截取几种方法（substring,split）

Java中String字符串截取几种方法substring,split这是一个Java中的String的基础用法的演示。下面通过代码对大家进行讲解substring这里用来ndexOf,lastIndexOf这两个函数进行字符定位，一个是从前往后寻找第一个，一个是从后往前寻找第一个。splitspl...

（fastjson）java 如何将String(字符串)与JSON互转

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【JavaSE专栏38】Java常用类 String 解析，字符串的花式操作

本文讲解了 Java 中常用类 String 的语法、使用说明和应用场景，并给出了样例代码。一、什么是String类在 Java 中，String 类是一个常用的类，用于表示字符串。它是不可变的，也就是说一旦创建就不能修改。String 类提供了许多方法来操作字符串，例如拼接、截取、替换、转换大小写...

Java：String.format格式化浮点数保留指定小数位输出字符串

利用String.format可以格式化输出字符串方法签名public static String format(String format, Object... args);常用的占位符%d 整数%s 字符串%f 浮点数示例// 输出浮点数 String.format("%f", 3.141592...

Java中String、StringBuffer和StringBuilder字符串拼接原理

关于这三者的应用场景：String：适用于少量的字符串操作的情况；StringBuilder：适用于单线程下在字符缓冲区进行大量操作的情况；StringBuffer：适用多线程下在字符缓冲区进行大量操作的情况；这三者场景不同，是由其多方面原因造成的。1.运行的速度快慢：S...

【Java】String类的理解及字符串常量池

一. String类简介1. 介绍字符串广泛应用在 Java 编程中，在 Java 中字符串属于对象，Java 提供了 String 类来创建和操作字符串。Java的String类在lang包里，java.lang.String是java字符串类，包含了字符串的值和实现字符串相关操作的一些方法；j...

使用Java进行Clob转String字符串

背景oracle字段类型varchar2最大长度4000，超过的怎么办解决使用clob类型，大字段，无长度限制问题使用Java的JDBC读取的RS获取的clob类型无法正常使用，封装的rs.getObject()。字段内容确定是字符串，那么怎么正常读取字符串？还不改变封装的数据获取方法？方案// 检...

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