Difference between revisions of "Compiling and the Java Virtual Machine"
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You do not need to understand everything that is covered in this section. The point of this section is to give you a basic understanding of how lines of code becomes a program that your computer can run, and why Java does this differently. |Chapter_TOC=[[Java Fundamentals]]}} | You do not need to understand everything that is covered in this section. The point of this section is to give you a basic understanding of how lines of code becomes a program that your computer can run, and why Java does this differently. |Chapter_TOC=[[Java Fundamentals]]}} | ||
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| + | =Compiling= | ||
What happens when you click on "Compile Java" in Textpad? How do the lines of code that you write become a program that you can run on your computer? | What happens when you click on "Compile Java" in Textpad? How do the lines of code that you write become a program that you can run on your computer? | ||
| − | = | + | When you compile a program, a program called the '''compiler''' translates text written in one programming language into another programming language. Java is a programming language that is (relatively) comprehensible by humans; it takes a while to learn, but once you learn the fundamentals of Java, you can read another Java program and understand the basics of what it is doing. A computer, on the other hand, understands a different language that is not comprehensible by humans; each instruction is encoded as a sequence of 0's and 1's (e.g., 4+5 might be 1010 1000 1011 0100). The language that a computer understands is called machine code, or machine language. This is explained in greater detail in Chapter 2's [[What Is Programming Part II|Further reading]]. |
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| + | In general, a compiler takes lines of code and outputs the equivalent machine code that a computer can run. | ||
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| + | // Todo: add compiler definition to the glossary | ||
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| + | =The Java Compiler= | ||
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| + | We use many different types of computers every day: we use a Windows computer | ||
| − | + | [[Template:1010Topic2]] | |
Revision as of 11:45, 27 November 2007
COMP 1010 Home > Java Fundamentals
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IntroductionBefore you can run your Java program, you must compile it. Java is different than most programming languages because a program compiled on your computer will work on any other device that has a Java Virtual Machine, such as a cell phone.
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Compiling
What happens when you click on "Compile Java" in Textpad? How do the lines of code that you write become a program that you can run on your computer?
When you compile a program, a program called the compiler translates text written in one programming language into another programming language. Java is a programming language that is (relatively) comprehensible by humans; it takes a while to learn, but once you learn the fundamentals of Java, you can read another Java program and understand the basics of what it is doing. A computer, on the other hand, understands a different language that is not comprehensible by humans; each instruction is encoded as a sequence of 0's and 1's (e.g., 4+5 might be 1010 1000 1011 0100). The language that a computer understands is called machine code, or machine language. This is explained in greater detail in Chapter 2's Further reading.
In general, a compiler takes lines of code and outputs the equivalent machine code that a computer can run.
// Todo: add compiler definition to the glossary
The Java Compiler
We use many different types of computers every day: we use a Windows computer
