Let us now take a look at what is more exciting and innovation in JDK5. I want to introduce a relatively practical characteristic: static import! Look directly, it's easy to understand:
Package staticex;
Public class transcendentalconstants {
Public Static Final Double Pi = 3.14159;
Public Static Final Double E = 2.71828;
}
Public class IrrationalConstants {
Public Static Final Double SQRT_TWO = 1.414;
Public static final double sqrt_three = 1.732;
}
// Import static variables and methods in the class
Package staticex;
Import static static sitex.irrationalconstants.sqrt_two;
Import static staticex.irrationalconstants.sqrt_three;
Import static staticex.transcendentalconstants.pi;
Public class constantswithstaticimport {
Public Static Double Sinpioverfour () {
Return SQRT_TWO / 2;
}
Public static void main (String [] args) {
System.out.println ("PI Is ApproxImately" Pi);
System.out.println ("THE SIN OF PI / 4 IS ABOUT"
SINPIOVERFOUR ());
}
}
JDK5 provides new features that import static classes, methods, and attributes. It is easy to get started. As for applicable places, you will watch itself!
