| Profiel van Cheet忘了烦恼 可爱多好™Foto'sWeblogLijsten |  Extra  Help |
|
14 januari Java Interview QuestionsOriginal URL: http://www.pokesoft.org/blog/?p=250  What if the main method is declared as private? The program compiles properly but at runtime it will give “Main method not public.” message. What is meant by pass by reference and pass by value in Java? Pass by reference means, passing the address itself rather than passing the value. Pass by value means passing a copy of the value. If you’re overriding the method equals() of an object, which other method you might also consider? hashCode() What is Byte Code? Or What gives java it’s “write once and run anywhere” nature? All Java programs are compiled into class files that contain bytecodes. These byte codes can be run in any platform and hence java is said to be platform independent. Expain the reason for each keyword of public static void main(String args[])? public- main(..) is the first method called by java environment when a program is executed so it has to accessible from java environment. Hence the access specifier has to be public. static: Java environment should be able to call this method without creating an instance of the class , so this method must be declared as static. void: main does not return anything so the return type must be void The argument String indicates the argument type which is given at the command line and arg is an array for string given during command line. What are the differences between == and .equals() ? Or what is difference between == and equals Or Difference between == and equals method Or What would you use to compare two String variables - the operator == or the method equals()? Or How is it possible for two String objects with identical values not to be equal under the == operator? The == operator compares two objects to determine if they are the same object in memory i.e. present in the same memory location. It is possible for two String objects to have the same value, but located in different areas of memory. == compares references while .equals compares contents. The method public boolean equals(Object obj) is provided by the Object class and can be overridden. The default implementation returns true only if the object is compared with itself, which is equivalent to the equality operator == being used to compare aliases to the object. String, BitSet, Date, and File override the equals() method. For two String objects, value equality means that they contain the same character sequence. For the Wrapper classes, value equality means that the primitive values are equal.
Output == comparison : true == comparison : true Using equals method : true false Using equals method : true What if the static modifier is removed from the signature of the main method? Or What if I do not provide the String array as the argument to the method? Program compiles. But at runtime throws an error “NoSuchMethodError”. 11 januari 哆啦A梦换装Original URL: http://www.pokesoft.org/blog/?p=245 你要使用现有的道具把哆啦A梦剧场版中的造型拼出来，要在规定时间完成30个造型，只有真正看过哆啦A梦全部剧场版的人才能达到。 操作方法：鼠标拖动物品到哆啦A梦身上即可，左边数字圆圈可以选择不同关卡，黑色剪影可以作参考，换装完成后按黄色按钮检查。 04 januari 【转】大学和高中的可悲区别，感觉到了么？Original URL: http://www.pokesoft.org/blog/?p=243 校内上转的,有些我也感觉的到呵呵~
|
|
|
