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Short: The most rarely used data type in java is short. E:incompatible types Short data type is best suitable for 16 bit processors like but these processors are completely outdated and hence the corresponding short data type is also out data type. Int: This is most commonly used data type in java. E:incompatible types long: Whenever int is not enough to hold big values then we should go for long data type.
Example: To hold the no. Of characters present in a big file int may not enough hence the return type of length method is long. If we want to represent real numbers then we should go for floating point data types.
Floating Point Data types: Float double If we want to 5 to 6 decimal places of accuracy then we should go for float. If we want to 14 to 15 decimal places of accuracy then we should go for double. Size:4 bytes. Size:8 bytes. Which of the following boolean declarations are valid?
In java we are allowed to use any worldwide alphabets character and java is Unicode based and no. E:possible loss of precision Summary of java primitive data type: data type Size Range byte 1 byte to 2 to 15 Corresponding Wrapper class Default value Byte 0 Short 0 15 short 2 bytes -2 to 2 -1 to int 4 bytes to Integer to 0 long 8 bytes to Long 0 float 4 bytes Literals: Any constant value which can be assigned to the variable is called literal.
Example: Integral Literals: For the integral data types byte, short, int and long we can specify literal value in the following ways. Literal value should be prefixed with zero.
For the extra digits we can use both upper case and lower case characters. This is one of very few areas where java is not case sensitive. Literal value should be prefixed with ox or oX. Which of the following are valid declarations? E:possible loss of precision invalid found : long required : int There is no direct way to specify byte and short literals explicitly. But whenever we are assigning integral literal to the byte variables and its value within the range of byte compiler automatically treats as byte literal.
Similarly short literal also. E:possible loss of precision invalid Floating Point Literals: Floating point literal is by default double type but we can specify explicitly as float type by suffixing with f or F. E:malformed floating point literal invalid Which of the following floating point declarations are valid? E:possible loss of precision We can specify floating point literal even in exponential form also significant notation.
Example: 1. E:unclosed character literal invalid 2 We can specify a char literal as integral literal which represents Unicode of that character. We can specify that integral literal either in decimal or octal or hexadecimal form but allowed values range is 0 to E:cannot find symbol 4.
E:illegal escape character 5. Every escape character in java acts as a char literal. E:unclosed character literal invalid none of the above. Binary Literals 2. Decimal 2. Octal 3. The allowed digits are 0 to 1. Literal value should be prefixed with Ob or OB.
Introduction An array is an indexed collection of fixed number of homogeneous data elements. The main advantage of arrays is we can represent multiple values with the same name so that readability of the code will be improved. But the main disadvantage of arrays is: Fixed in size that is once we created an array there is no chance of increasing or decreasing the size based on our requirement that is to use arrays concept compulsory we should know the size in advance which may not possible always.
We can resolve this problem by using collections. E: expected invalid Note : If we want to specify the dimension before the variable that rule is applicable only for the 1st variable. Second variable onwards we can't apply in the same declaration. Example: Array construction: Every array in java is an object hence we can create by using new operator. E:array dimension missing Rule 2: It is legal to have an array with size zero in java. Download 30 discount with free shipping on book core java an integrated approach by r.
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