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Java 教程

Java HOME Java Intro Java Get Started Java Syntax Java Output Java Comments Java Variables Java Data Types Java Type Casting Java Operators Java Strings Java Math Java Booleans Java If...Else Java Switch Java While Loop Java For Loop Java Break/Continue Java Arrays

Java Methods

Java Methods Java Method Parameters Java Method Overloading Java Scope Java Recursion

Java Classes

Java OOP Java Classes/Objects Java Class Attributes Java Class Methods Java Constructors Java Modifiers Java Encapsulation Java Packages / API Java Inheritance Java Polymorphism Java Inner Classes Java Abstraction Java Interface Java Enums Java User Input Java Date Java ArrayList Java LinkedList Java List Sorting Java HashMap Java HashSet Java Iterator Java Wrapper Classes Java Exceptions Java RegEx Java Threads Java Lambda Java Advanced Sorting

Java File Handling

Java Files Java Create/Write Files Java Read Files Java Delete Files

Java How To's

Add Two Numbers Count Words Reverse a String Sum of Array Elements Convert String to Array Sort an Array Find Array Average Find Smallest Element ArrayList Loop HashMap Loop Loop Through an Enum Area of Rectangle Even or Odd Number Positive or Negative Square Root Random Number

Java 参考

Java Reference Java Keywords Java String Methods Java Math Methods Java Output Methods Java Arrays Methods Java ArrayList Methods Java LinkedList Methods Java HashMap Methods Java Scanner Methods Java Iterator Methods Java Errors & Exceptions

Java 示例

Java Examples Java Compiler Java Exercises Java Quiz Java Server Java Certificate


Java 字符串连接


字符串连接

在字符串之间可以使用 + 运算符来连接它们。这被称为连接

示例

String firstName = "John";
String lastName = "Doe";
System.out.println(firstName + " " + lastName);

自己动手试一试 »

请注意,我们添加了一个空的文本(" ")以在打印时创建 firstName 和 lastName 之间的空格。

您还可以使用 concat() 方法来连接两个字符串。

示例

String firstName = "John ";
String lastName = "Doe";
System.out.println(firstName.concat(lastName));

自己动手试一试 »




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