miniJava

This is a subset of Java. Imprementing its interpreter, I deepen my understanding.

miniJava1

What is to implement

• declaration
• substitution
• single class
• method with none argument
• int and boolean value
• binary operation
• if statement
• while statement
• input from one file
• simple method calling
• out is abbreviation of System.out.println
• type checking before executing

Example

class Test {
	void main() {
		int x;
		x = x + 1;
		out(x);
		if (x == 0) {
			x = x - 2;
		} else if (x == 1) {
			x = x + 1;
		} else if (x == 2) {
			x = x + 3;
		} else {
			x = 100;
		}
		out(x);

		show();

		int y;
		while (y<100) {
			y = y + 1;
		}
		out(y);
	}

	void show() {
		out(3);
		out(true);
		out(2525252);
	}
}