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Follow the steps given below, to integrate Ant into Eclipse.Make sure that the build.xml is a part of your java project, and does not reside at a location that is external to the project.Enable Ant View by following Window > Show View > Other > Ant > Ant.Open Project Explorer, drag the build.xml into the Ant View.Your Ant view looks similar to –Clicking on the targets, build / clean / usage will run Ant with the target. Clicking "fax" will execute the default target - usage.The Ant Eclipse plugin also comes with a good editor for editing build.xml files. The ... Read More
All exception classes are subtypes of the java.lang.Exception class. The Exception class is a subclass of the Throwable class. Other than the Exception class there is another subclass called Error which is derived from the Throwable class.
The StringBuffer and StringBuilder classes are used when there is a necessity to make a lot of modifications to Strings of characters.Unlike Strings, objects of type StringBuffer and String builder can be modified over and over again without leaving behind a lot of new unused objects.The StringBuilder class was introduced as of Java 5 and the main difference between the StringBuffer and StringBuilder is that StringBuilder’s methods are not thread safe (not synchronized).It is recommended to use StringBuilder whenever possible because it is faster than StringBuffer. However, if the thread safety is necessary, the best option is StringBuffer objects.Read More
To use comparison operator for numeric string, use the substring() method. Let us first create a table −mysql> create table DemoTable1881 ( UserId int, UserEducationGap varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1881 values(101, '5-9'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(102, '2-4'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(103, '4-8'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(104, '7-12'); Query OK, 1 row affected (0.00 sec)Display all records ... Read More
The keys() method of Python dictionary class returns a view object consisting of keys used in the dictionary.>>> d1 = {'name': 'Ravi', 'age': 21, 'marks': 60, 'course': 'Computer Engg'} >>>d1.keys() dict_keys(['name', 'age', 'marks', 'course'])It can be stored as a list object. If new key-value pair is added, the view object is automatically updated.>>> l1=d1.keys() >>> l1 dict_keys(['name', 'age', 'marks', 'course']) >>>d1.update({"college":"IITB"}) >>> l1 dict_keys(['name', 'age', 'marks', 'course', 'college'])
Dictionary object is an unordered collection of key-value pairs, separated by comma and enclosed in curly brackets. Association of value with key is marked by : symbol between them.>>> D1={'a':1,'b':2,'c':3}Key can appear in a dictionary object only once, whereas single value can be assigned to multiple keys. Key should be of immutable data type i.e. number, string or tuple.>>> D2={1:'aaa', 2:'bbb', 3:'ccc'} >>> D3={(10,10):'x1', (20,20):'x2'} >>> D4={'Microsoft':['MS Office', 'Windows', 'C#'], 'Oracle':['Oracle', 'Java', 'MySQL']}
Python’s number conversion function float() converts an integer to float with fractional part as 0. It also parses a string with valid representation of float number to a float object.>>> float('1.11') 1.11 >>> float(1) 1.0 >>> float('1') 1.0 >>> float('1.1e-2') 0.011
We have use oct() function from Python’s library to convert any integer to its octal equivalent number. We get a string having octal representation>>> oct(100) '0o144' >>> oct(0x10) '0o20' >>> oct(10) '0o12'
We can use built in hex() function to convert any integer to its hexadecimal representation.>>> hex(100) '0x64' >>> hex(4095) '0xfff' >>> hex(31) '0x1f'
We can use zip() function to produce an iterable from two tuple objects, each corresponding to key and value items and then use dict() function to form dictionary object>>> T1=('a','b','c','d') >>> T2=(1,2,3,4) >>> dict((x,y) for x,y in zip(t1,t2))Dictionary comprehension syntax can also be used to construct dictionary object from two tuples>>> d={k:v for (k,v) in zip(T1,T2)} >>> d {'a': 1, 'b': 2, 'c': 3, 'd': 4}