Interview Question 7: What is the difference between a static variable and an instance variable? __ Face Test

The difference between a static variable and an instance variable.

/*

The difference in syntax definition: the static key is added before the statically variable, and the instance variable is not previously added.
* The difference when the program is running: the instance variable belongs to the property of an object, and an instance object must be created in which the instance variable is allocated space.
* To use this instance variable. A static variable is not part of an instance object, but belongs to a class, so it is also called a class variable, as long as the program loads the class
* Byte code, without creating any instance objects, static variables will be allocated space, static variables can be used. In summary, instance variables must be
* The object can be used only after it is created, and static variables can be referenced directly using the class name.
* For example, for the following program, no matter how many instance objects are created, only one staticvar variable is ever assigned, and each
* Instance object, this staticvar will add 1; However, each instance object is created, and a instancevar is allocated, which may
* Assign multiple Instancevar, and each Instancevar value is only added 1 times.
*/

public class Test11 {public
	static int staticvar = 0;
	public int instancevar = 0;

	Public Test11 () {
		staticvar++;
		instancevar++;
		System.out.println ("staticvar=" + Staticvar + ", instancevar="
				+ Instancevar);
	}

	public static void Main (string[] args) {
//		Test11.staticvar = 1;
		
		Test11 test = new Test11 (); 1  1
		Test11 test1 = new Test11 ();//2  1
		Test11 test2 = new Test11 ();//3  1
		
//		test.staticvar=0;		test.instancevar=0
	}
}