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JDK5新特性之一----静态导入

来源:互联网  宽屏版  评论
2007-02-07 12:19:05

现在让我们来看看JDK5中有什么更激动人心的改进和创新,我要介绍的是其中的一个比较实用的特性:静态导入!

直接看一段代码吧,很容易就可以了解:

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;

}

//在类中导入静态变量和方法

package staticEx;

import static staticEx.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提供了导入静态类,方法,和属性的新特性,上手也很容易,至于适用的地方嘛,各位就自己看着办罗!

 
现在让我们来看看JDK5中有什么更激动人心的改进和创新,我要介绍的是其中的一个比较实用的特性:静态导入! 直接看一段代码吧,很容易就可以了解: 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; } //在类中导入静态变量和方法 package staticEx; import static staticEx.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提供了导入静态类,方法,和属性的新特性,上手也很容易,至于适用的地方嘛,各位就自己看着办罗!
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