After compiling the source code (javac City.java) and running the application (java City), you would observe null for name and 0 for population. The new operator zeroes an object's object ... 引用:https://blog.csdn.net/chenhao0568/article/details/52233783 Eclipse中 JAVA默认的兼容版本为1.4, 改为1.5及以上版本就行

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    public class TotalArea { /** Main method */ public static void main(String[] args) { // Declare circleArray CircleWithPrivateDataFields[] circleArray; // Create ...

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    printf places output on the standard output stream stdout. fprintf places output on the named output stream. sprintf places "output", followed by the null character (\0) in consecutive bytes starting at * s; it is the user's responsibility to ensure that enough storage is available. Re: How to make a double only print to 2 decimal places Posted 26 October 2011 - 09:34 AM May be a little summary of format specifier, when using printf() or format() everything after % to type indicator are formatting instructions and are in the following order:

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