Questions and Exercises: Expressions, Statements, and Blocks问题和练习：表达式、语句和块

Questions问题

1. Operators may be used in building ___, which compute values.运算符可用于构建表达式中，它用来计算值。
2. Expressions are the core components of ____.表达式是语句的核心组件。
3. Statements may be grouped into ___.语句可以分组成块。
4. The following code snippet is an example of a ___ expression.下面的代码段是一个合成表达式的示例。

   1 * 2 * 3

5. Statements are roughly equivalent to sentences in natural languages, but instead of ending with a period, a statement ends with a ___.语句大致相当于自然语言中的句子，但语句不是以句号结尾，而是以分号结尾。
6. A block is a group of zero or more statements between balanced ___ and can be used anywhere a single statement is allowed.块是对称花括号之间的一组零或多个语句，可以在允许单个语句的任何位置使用。

Exercises练习

Identify the following kinds of expression statements:确定以下类型的表达式语句：

• aValue = 8933.234;
• aValue++;
• System.out.println("Hello World!");
• Bicycle myBike = new Bicycle();

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