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3.5. OperatorsThe usual arithmetic operators +, -, *, / are used in Java for addition, subtraction, multiplication, and division. The / operator denot... 阅读全文
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3.4. VariablesIn Java, every variable has a type. You declare a variable by placing the type first, followed by the name of the variable. Here are som... 阅读全文
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3.3. Data TypesJava is a strongly typedlanguage（强类型语音）. This means that every variable must have a declared type（每个变量都必须声明类型）. There are eight primiti... 阅读全文
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Let’s look more closely at one of the simplest Java programs you can have—one that simply prints a message to console:public class FirstSample{ pub... 阅读全文