The basic classroom problem of Java language

1. Why is Java specified as the main entry point of the program is static?

Because static methods do not have to establish objects, the main function of the program must be referenced.

2. Scope of variables

public class Fun1 {
private static int v=1;
public static void Main (string[] args) {
int v=2;
System.out.println (v);
}
}

Result is 2

3. The reason why the double type is inaccurate

is related to the binary inside the computer

4.

Package fun;

public class Fun2 {
public static void Main (String args[]) {
int x=100;
int y=200;
System.out.println ("x+y=" +x+y);
System.out.println (x+y+ "=x+y");
}

}

Results

x+y=100200
300=x+y

Related to the order of operators, the most recent plus sign is the assignment.

The basic classroom problem of Java language