Does the main method get an initialized array or are the strings in the command line enter directly in to the...
up vote
-2
down vote
favorite
For example, if I want to print an array length, I can not do that:
public class Test{
public static void main(String args){
System.out.println(worngParam({"first", "second", "ect"}));
}
public static int worngParam(String strings){
return strings.length;
}
}
This is an error!
The first two lines in main must be
String strings = {"first", "second", "ect"};
System.out.println(worngParam(strings));
But even so I can do that:
System.out.println(args.length);//If of course args is not empty
My question is how does the parameter get into the main method?
Although any method can accept a constant variabls such as 3, "word", 'a'. But she can not get an initialization of an array like this {1,8} or {"word2", "word3"}
java arrays parameters command-line-arguments main
asked Nov 7 at 21:27
ploni almoni
32
add a comment |
up vote
-2
down vote
favorite
For example, if I want to print an array length, I can not do that:
public class Test{
public static void main(String args){
System.out.println(worngParam({"first", "second", "ect"}));
}
public static int worngParam(String strings){
return strings.length;
}
}
This is an error!
The first two lines in main must be
String strings = {"first", "second", "ect"};
System.out.println(worngParam(strings));
But even so I can do that:
System.out.println(args.length);//If of course args is not empty
My question is how does the parameter get into the main method?
Although any method can accept a constant variabls such as 3, "word", 'a'. But she can not get an initialization of an array like this {1,8} or {"word2", "word3"}
java arrays parameters command-line-arguments main
asked Nov 7 at 21:27
ploni almoni
32
1
You have to passnew String {"first", "second", "ect"}instead of{"first", "second", "ect"}when calling a method.
– GriffeyDog
Nov 7 at 21:53
1
{ "first", "second" }is called an array initializer, and is shorthand fornew String { "first", "second" }. The thing is, omitting thenew Stringpart is only allowed at the time of declaration of the array.
– MC Emperor
Nov 7 at 21:58
1
Theargsstring array is constructed by the JVM and passed to yourmain(String)method upon start.
– MC Emperor
Nov 7 at 22:03
add a comment |
up vote
-2
down vote
favorite
up vote
-2
down vote
favorite
For example, if I want to print an array length, I can not do that:
public class Test{
public static void main(String args){
System.out.println(worngParam({"first", "second", "ect"}));
}
public static int worngParam(String strings){
return strings.length;
}
}
This is an error!
The first two lines in main must be
String strings = {"first", "second", "ect"};
System.out.println(worngParam(strings));
But even so I can do that:
System.out.println(args.length);//If of course args is not empty
My question is how does the parameter get into the main method?
Although any method can accept a constant variabls such as 3, "word", 'a'. But she can not get an initialization of an array like this {1,8} or {"word2", "word3"}
java arrays parameters command-line-arguments main
asked Nov 7 at 21:27
ploni almoni
32
For example, if I want to print an array length, I can not do that:
public class Test{
public static void main(String args){
System.out.println(worngParam({"first", "second", "ect"}));
}
public static int worngParam(String strings){
return strings.length;
}
}
This is an error!
The first two lines in main must be
String strings = {"first", "second", "ect"};
System.out.println(worngParam(strings));
But even so I can do that:
System.out.println(args.length);//If of course args is not empty
My question is how does the parameter get into the main method?
Although any method can accept a constant variabls such as 3, "word", 'a'. But she can not get an initialization of an array like this {1,8} or {"word2", "word3"}
java arrays parameters command-line-arguments main
java arrays parameters command-line-arguments main
asked Nov 7 at 21:27
ploni almoni
32
asked Nov 7 at 21:27
ploni almoni
32
edited Nov 7 at 21:43
asked Nov 7 at 21:27
ploni almoni
32
asked Nov 7 at 21:27
ploni almoni
32
asked Nov 7 at 21:27
ploni almoni
32
32
1
You have to passnew String {"first", "second", "ect"}instead of{"first", "second", "ect"}when calling a method.
– GriffeyDog
Nov 7 at 21:53
1
{ "first", "second" }is called an array initializer, and is shorthand fornew String { "first", "second" }. The thing is, omitting thenew Stringpart is only allowed at the time of declaration of the array.
– MC Emperor
Nov 7 at 21:58
1
Theargsstring array is constructed by the JVM and passed to yourmain(String)method upon start.
– MC Emperor
Nov 7 at 22:03
add a comment |
1
You have to passnew String {"first", "second", "ect"}instead of{"first", "second", "ect"}when calling a method.
– GriffeyDog
Nov 7 at 21:53
1
{ "first", "second" }is called an array initializer, and is shorthand fornew String { "first", "second" }. The thing is, omitting thenew Stringpart is only allowed at the time of declaration of the array.
– MC Emperor
Nov 7 at 21:58
1
Theargsstring array is constructed by the JVM and passed to yourmain(String)method upon start.
– MC Emperor
Nov 7 at 22:03
1
1
You have to pass
new String {"first", "second", "ect"} instead of {"first", "second", "ect"} when calling a method.– GriffeyDog
Nov 7 at 21:53
You have to pass
new String {"first", "second", "ect"} instead of {"first", "second", "ect"} when calling a method.– GriffeyDog
Nov 7 at 21:53
1
1
{ "first", "second" } is called an array initializer, and is shorthand for new String { "first", "second" }. The thing is, omitting the new String part is only allowed at the time of declaration of the array.– MC Emperor
Nov 7 at 21:58
{ "first", "second" } is called an array initializer, and is shorthand for new String { "first", "second" }. The thing is, omitting the new String part is only allowed at the time of declaration of the array.– MC Emperor
Nov 7 at 21:58
1
1
The
args string array is constructed by the JVM and passed to your main(String) method upon start.– MC Emperor
Nov 7 at 22:03
The
args string array is constructed by the JVM and passed to your main(String) method upon start.– MC Emperor
Nov 7 at 22:03
add a comment |
1 Answer
1
active
oldest
votes
up vote
0
down vote
accepted
Supposed you run your java class file like this
javac Test.java
java -cp . Test firstParam secondParam thirdParam
Then in your main method args will have a value like
args = new String{"firstParam", "secondParam", "thirdParam"};
answered Nov 7 at 23:35
Donat
3566
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
accepted
Supposed you run your java class file like this
javac Test.java
java -cp . Test firstParam secondParam thirdParam
Then in your main method args will have a value like
args = new String{"firstParam", "secondParam", "thirdParam"};
answered Nov 7 at 23:35
Donat
3566
add a comment |
up vote
0
down vote
accepted
Supposed you run your java class file like this
javac Test.java
java -cp . Test firstParam secondParam thirdParam
Then in your main method args will have a value like
args = new String{"firstParam", "secondParam", "thirdParam"};
answered Nov 7 at 23:35
Donat
3566
add a comment |
up vote
0
down vote
accepted
up vote
0
down vote
accepted
Supposed you run your java class file like this
javac Test.java
java -cp . Test firstParam secondParam thirdParam
Then in your main method args will have a value like
args = new String{"firstParam", "secondParam", "thirdParam"};
answered Nov 7 at 23:35
Donat
3566
Supposed you run your java class file like this
javac Test.java
java -cp . Test firstParam secondParam thirdParam
Then in your main method args will have a value like
args = new String{"firstParam", "secondParam", "thirdParam"};
answered Nov 7 at 23:35
Donat
3566
edited Nov 10 at 19:12
answered Nov 7 at 23:35
Donat
3566
answered Nov 7 at 23:35
Donat
3566
answered Nov 7 at 23:35
Donat
3566
3566
add a comment |
add a comment |
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1
You have to pass
new String {"first", "second", "ect"}instead of{"first", "second", "ect"}when calling a method.– GriffeyDog
Nov 7 at 21:53
1
{ "first", "second" }is called an array initializer, and is shorthand fornew String { "first", "second" }. The thing is, omitting thenew Stringpart is only allowed at the time of declaration of the array.– MC Emperor
Nov 7 at 21:58
1
The
argsstring array is constructed by the JVM and passed to yourmain(String)method upon start.– MC Emperor
Nov 7 at 22:03