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Java 教程

Java 主页 Java 简介 Java 入门 Java 语法 Java 输出
打印文本 打印数字
Java 注释 Java 变量
变量 打印变量 多个变量 标识符 现实生活示例
Java 数据类型
数据类型 数字 布尔值 字符 现实生活示例 非基本类型
Java 类型转换 Java 运算符 Java 字符串
字符串 连接 数字和字符串 特殊字符
Java 数学 Java 布尔值 Java If...Else
if else else if 简写 If...Else 现实生活示例
Java Switch Java While 循环
While 循环 Do/While 循环 现实生活示例
Java For 循环
For 循环 嵌套循环 For-Each 循环 现实生活示例
Java Break/Continue Java 数组
数组 循环遍历数组 现实生活示例 多维数组

Java 方法

Java 方法 Java 方法参数
参数 返回值
Java 方法重载 Java 范围 Java 递归

Java 类

Java OOP Java 类/对象 Java 类属性 Java 类方法 Java 构造函数 Java 修饰符 Java 封装 Java 包/API Java 继承 Java 多态 Java 内部类 Java 抽象 Java 接口 Java 枚举 Java 用户输入 Java 日期 Java ArrayList Java LinkedList Java 列表排序 Java HashMap Java HashSet Java 迭代器 Java 包装类 Java 异常 Java 正则表达式 Java 线程 Java Lambda 表达式 Java 高级排序

Java 文件处理

Java 文件 Java 创建/写入文件 Java 读取文件 Java 删除文件

Java 如何做

添加两个数字 统计单词 反转字符串 数组元素的总和 将字符串转换为数组 排序数组 查找数组平均值 查找最小元素 ArrayList 循环 HashMap 循环 循环遍历枚举 矩形的面积 偶数或奇数 正数或负数 平方根 随机数

Java 参考

Java 参考 Java 关键字
assert abstract boolean break byte case catch char class continue default do double else enum exports extends final finally float for if implements import instanceof int interface long module native new package private protected public return requires short static super switch synchronized this throw throws transient try var void volatile while
Java 字符串方法
charAt() codePointAt() codePointBefore() codePointCount() compareTo() compareToIgnoreCase() concat() contains() contentEquals() copyValueOf() endsWith() equals() equalsIgnoreCase() format() getBytes() getChars() hashCode() indexOf() isEmpty() join() lastIndexOf() length() matches() offsetByCodePoints() regionMatches() replace() replaceAll() replaceFirst() split() startsWith() subSequence() substring() toCharArray() toLowerCase() toString() toUpperCase() trim() valueOf()
Java 数学方法
abs() acos() addExact() asin() atan() atan2() cbrt() ceil() copySign() cos() cosh() decrementExact() exp() expm1() floor() floorDiv() floorMod() getExponent() hypot() IEEEremainder() incrementExact() log() log10() log1p() max() min() multiplyExact() negateExact() nextAafter() nextDown() nextUp() pow() random() rint() round() scalb() signum() sin() sinh() sqrt() subtractExact() tan() tanh() toDegrees() toIntExact() toRadians() ulp()
Java 输出方法
print() printf() println()
Java 数组方法
compare() equals() sort() fill() length
Java ArrayList 方法
add() addAll() clear() clone() contains ensureCapacity() forEach() get() indexOf() isEmpty() iterator() lastIndexOf() listIterator() remove() removeAll() removeIf() replaceAll() retainAll() set() size() sort() spliterator() subList() toArray() trimToSize()
Java LinkedList 方法
add() addAll() clear() clone() contains forEach() get() getFirst() getLast() indexOf() isEmpty() iterator() lastIndexOf() listIterator() remove() removeAll() removeFirst() removeIf() removeLast() replaceAll() retainAll() set() size() sort() spliterator() subList() toArray()
Java HashMap 方法
clear() clone() compute() computeIfAbsent() computeIfPresent() containsKey() containsValue() entrySet() forEach() get() getOrDefault() isEmpty() keySet() merge() put() putAll() putIfAbsent() remove() replace() replaceAll() size() values()
Java Scanner 方法
close() delimiter() findInLine() findWithinHorizon() hasNext() hasNextBoolean() hasNextByte() hasNextDouble() hasNextFloat() hasNextInt() hasNextLine() hasNextLong() hasNextShort() locale() next() nextBoolean() nextByte() nextDouble() nextFloat() nextInt() nextLine() nextLong() nextShort() radix() reset() useDelimiter() useLocale() useRadix()
Java 迭代器方法 Java 错误 & 异常

Java 示例

Java 示例 Java 编译器 Java 练习 Java 测验 Java 服务器 Java 证书


Java char 关键字

❮ Java 关键字

示例

char myGrade = 'B';
System.out.println(myGrade);

自己尝试 »

定义和用法

The char 关键字是用于存储单个字符的数据类型。

char 值必须用单引号括起来，如 'A' 或 'c'。

相关页面

在我们的 Java 数据类型教程 中了解更多关于数据类型的信息。

❮ Java 关键字

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