Method Parameters:
Types of Method Parameters in Java:
a) Formal Parameters-->They are the parameters defined in the method definition.
b) Actual Parameters--> They are the parameters defined in the method call.
c) Final parameter--> If a formal parameter is declared to be final, then its value cannot be changed during its lifetime in the method body.
Note: Widening, narrowing, type promotion rule applies to the parameter passing as well. They are equivalent to assignment conversions.
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2. Arrays:
a) Array--> Its a collection of homogeneous data elements.
b) Array Declaration-->Syntax for array declaration is as follows:
(datatype)[](arrayname) or (datatype) (arrayname)[]
c) Array Construction--> This means allocating space to the array in computer memory. Its syntax is:
(arrayname)=new (datatype)[(arraysize)]
d) Value assignment--> This means assigning values to the array elements.
e) Array Initialization--> Java provides the means of declaring, constructing and explicitly initializing an array in one declaration. Its syntax is:
(datatype)[](arrayname)={(array initialization list)};
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3. Anonymous Array--> They are used to initialize the array objects which are already declared. like:
int a[];
a=new int[]{1,5,5,3,9,7,3}; we cannot use a={1,5,5,3,9,7,3}; to initialize an array already declared.
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a) Formal Parameters-->They are the parameters defined in the method definition.
b) Actual Parameters--> They are the parameters defined in the method call.
c) Final parameter--> If a formal parameter is declared to be final, then its value cannot be changed during its lifetime in the method body.
Note: Widening, narrowing, type promotion rule applies to the parameter passing as well. They are equivalent to assignment conversions.
***************************************
2. Arrays:
a) Array--> Its a collection of homogeneous data elements.
b) Array Declaration-->Syntax for array declaration is as follows:
(datatype)[](arrayname) or (datatype) (arrayname)[]
c) Array Construction--> This means allocating space to the array in computer memory. Its syntax is:
(arrayname)=new (datatype)[(arraysize)]
d) Value assignment--> This means assigning values to the array elements.
e) Array Initialization--> Java provides the means of declaring, constructing and explicitly initializing an array in one declaration. Its syntax is:
(datatype)[](arrayname)={(array initialization list)};
*******************************
3. Anonymous Array--> They are used to initialize the array objects which are already declared. like:
int a[];
a=new int[]{1,5,5,3,9,7,3}; we cannot use a={1,5,5,3,9,7,3}; to initialize an array already declared.
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This post first appeared on SCJP Tutorial -1.5 Tips And Tricks, please read the originial post: here
