static import

Static import支持略去类型名的public static字段使用

如：
import static java.lang.Math.PI;
import static java.lang.Math.pow;
或全部:
import static java.lang.Math.*;

例子：

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
        System.out.println("Considering a circle with a diameter of 5 cm, it has:");
        System.out.println("A circumference of " + (Math.PI * 5) + "cm");
        System.out.println("And an area of " + (Math.PI * Math.pow(5,2)) + "sq. cm");
    }
}

简化为：

import static java.lang.Math.*;
import static java.lang.System.out;
public class HelloWorld {
    public static void main(String[] args) {
        out.println("Hello World!");
        out.println("Considering a circle with a diameter of 5 cm, it has:");
        out.println("A circumference of " + (PI * 5) + "cm");
        out.println("And an area of " + (PI * pow(5,2)) + "sq. cm");
    }
}

一些简单的语法糖，好像没什么大用