Method containing interface as parameter
0
hello how do I call a method taking an interface as a parameter from the main ?
The code in the main is an example of what I want to achieve but by calling the method map now
What do I write in my map method and how do I call it in the main ? Thank you
What I want to achieve :
StringTransformation addBlah = (e) -> {
e += "boo";
return e;
};
System.out.println(addBlah.transf("Hello")); // prints Helloboo
public class Main{
public static void main(String args) {
String a = hello;
// How do I modify the string a by calling map ?
}
void map(StringTransformation t) {
// What do I write ??
}
}
public interface StringTransformation {
String transf(String s);
}
java interface
asked Nov 14 '18 at 19:36
Joon1Joon1
32
|
show 3 more comments
0
hello how do I call a method taking an interface as a parameter from the main ?
The code in the main is an example of what I want to achieve but by calling the method map now
What do I write in my map method and how do I call it in the main ? Thank you
What I want to achieve :
StringTransformation addBlah = (e) -> {
e += "boo";
return e;
};
System.out.println(addBlah.transf("Hello")); // prints Helloboo
public class Main{
public static void main(String args) {
String a = hello;
// How do I modify the string a by calling map ?
}
void map(StringTransformation t) {
// What do I write ??
}
}
public interface StringTransformation {
String transf(String s);
}
java interface
asked Nov 14 '18 at 19:36
Joon1Joon1
32
With out the interface definition it's hard to say. Please include the code for the interface.
– markspace
Nov 14 '18 at 19:38
1
You pass an instance of a class that has implemented said interface.
– KevinO
Nov 14 '18 at 19:38
@markspace Sorry I forgot, I added it now
– Joon1
Nov 14 '18 at 19:39
1
Also, unless I missed something,mapwill need to bestaticto be called frommain.
– KevinO
Nov 14 '18 at 19:40
Aside: you can simply usee -> e += "boo"as your lambda declaration. No need for braces or return, sincea += bis an expression.
– Andy Turner
Nov 14 '18 at 19:42
|
show 3 more comments
0
0
0
hello how do I call a method taking an interface as a parameter from the main ?
The code in the main is an example of what I want to achieve but by calling the method map now
What do I write in my map method and how do I call it in the main ? Thank you
What I want to achieve :
StringTransformation addBlah = (e) -> {
e += "boo";
return e;
};
System.out.println(addBlah.transf("Hello")); // prints Helloboo
public class Main{
public static void main(String args) {
String a = hello;
// How do I modify the string a by calling map ?
}
void map(StringTransformation t) {
// What do I write ??
}
}
public interface StringTransformation {
String transf(String s);
}
java interface
asked Nov 14 '18 at 19:36
Joon1Joon1
32
hello how do I call a method taking an interface as a parameter from the main ?
The code in the main is an example of what I want to achieve but by calling the method map now
What do I write in my map method and how do I call it in the main ? Thank you
What I want to achieve :
StringTransformation addBlah = (e) -> {
e += "boo";
return e;
};
System.out.println(addBlah.transf("Hello")); // prints Helloboo
public class Main{
public static void main(String args) {
String a = hello;
// How do I modify the string a by calling map ?
}
void map(StringTransformation t) {
// What do I write ??
}
}
public interface StringTransformation {
String transf(String s);
}
java interface
java interface
asked Nov 14 '18 at 19:36
Joon1Joon1
32
asked Nov 14 '18 at 19:36
Joon1Joon1
32
edited Nov 14 '18 at 19:57
Joon1
asked Nov 14 '18 at 19:36
Joon1Joon1
32
asked Nov 14 '18 at 19:36
Joon1Joon1
32
asked Nov 14 '18 at 19:36
Joon1Joon1
32
32
With out the interface definition it's hard to say. Please include the code for the interface.
– markspace
Nov 14 '18 at 19:38
1
You pass an instance of a class that has implemented said interface.
– KevinO
Nov 14 '18 at 19:38
@markspace Sorry I forgot, I added it now
– Joon1
Nov 14 '18 at 19:39
1
Also, unless I missed something,mapwill need to bestaticto be called frommain.
– KevinO
Nov 14 '18 at 19:40
Aside: you can simply usee -> e += "boo"as your lambda declaration. No need for braces or return, sincea += bis an expression.
– Andy Turner
Nov 14 '18 at 19:42
|
show 3 more comments
With out the interface definition it's hard to say. Please include the code for the interface.
– markspace
Nov 14 '18 at 19:38
1
You pass an instance of a class that has implemented said interface.
– KevinO
Nov 14 '18 at 19:38
@markspace Sorry I forgot, I added it now
– Joon1
Nov 14 '18 at 19:39
1
Also, unless I missed something,mapwill need to bestaticto be called frommain.
– KevinO
Nov 14 '18 at 19:40
Aside: you can simply usee -> e += "boo"as your lambda declaration. No need for braces or return, sincea += bis an expression.
– Andy Turner
Nov 14 '18 at 19:42
With out the interface definition it's hard to say. Please include the code for the interface.
– markspace
Nov 14 '18 at 19:38
With out the interface definition it's hard to say. Please include the code for the interface.
– markspace
Nov 14 '18 at 19:38
1
1
You pass an instance of a class that has implemented said interface.
– KevinO
Nov 14 '18 at 19:38
You pass an instance of a class that has implemented said interface.
– KevinO
Nov 14 '18 at 19:38
@markspace Sorry I forgot, I added it now
– Joon1
Nov 14 '18 at 19:39
@markspace Sorry I forgot, I added it now
– Joon1
Nov 14 '18 at 19:39
1
1
Also, unless I missed something,
map will need to be static to be called from main.– KevinO
Nov 14 '18 at 19:40
Also, unless I missed something,
map will need to be static to be called from main.– KevinO
Nov 14 '18 at 19:40
Aside: you can simply use
e -> e += "boo" as your lambda declaration. No need for braces or return, since a += b is an expression.– Andy Turner
Nov 14 '18 at 19:42
Aside: you can simply use
e -> e += "boo" as your lambda declaration. No need for braces or return, since a += b is an expression.– Andy Turner
Nov 14 '18 at 19:42
|
show 3 more comments
2 Answers
2
active
oldest
votes
0
You cannot call map inside the static main method. You must make map a static method as well if you want to do that. Also we can't help you with what to put inside your map function if you don't tell us what it should do.
public static void main(String args) {
String string = "Hello";
// you can call `mapBoo` like normal here
string = mapBoo(string);
System.out.println(string);
List<String> strings = Arrays.asList("Hello", "this", "is", "a", "test");
// or you can pass mapBoo into the stream.map method since map fits the method signature
List<String> mappedStrings = strings.stream().map(Main::mapBoo)
.collect(Collectors.toList());
for (String mappedString : mappedStrings)
System.out.println(mappedString);
}
static String mapBoo(String s) {
return s + "boo";
}
answered Nov 14 '18 at 19:55
xtraticxtratic
2,4971822
I have a string a = "Hello" initialized in the main class and when I call map from the main I want it to modify string a to "Helloboo"
– Joon1
Nov 14 '18 at 20:00
add a comment |
0
You want to modify a String with a given StringTransformation so you need to pass both of them to the map method. Also you can turn addBlah in a more simple lambda :
public static void main(String args) {
StringTransformation addBlah = (e) -> e + "boo";
String str = "Hello";
System.out.println(str); // Hello
str = map(addBlah, str);
System.out.println(str); // Helloboo
}
static String map(StringTransformation t, String argument) {
return t.transf(argument);
}
answered Nov 14 '18 at 20:06
azroazro
11.3k41638
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
You cannot call map inside the static main method. You must make map a static method as well if you want to do that. Also we can't help you with what to put inside your map function if you don't tell us what it should do.
public static void main(String args) {
String string = "Hello";
// you can call `mapBoo` like normal here
string = mapBoo(string);
System.out.println(string);
List<String> strings = Arrays.asList("Hello", "this", "is", "a", "test");
// or you can pass mapBoo into the stream.map method since map fits the method signature
List<String> mappedStrings = strings.stream().map(Main::mapBoo)
.collect(Collectors.toList());
for (String mappedString : mappedStrings)
System.out.println(mappedString);
}
static String mapBoo(String s) {
return s + "boo";
}
answered Nov 14 '18 at 19:55
xtraticxtratic
2,4971822
I have a string a = "Hello" initialized in the main class and when I call map from the main I want it to modify string a to "Helloboo"
– Joon1
Nov 14 '18 at 20:00
add a comment |
0
You cannot call map inside the static main method. You must make map a static method as well if you want to do that. Also we can't help you with what to put inside your map function if you don't tell us what it should do.
public static void main(String args) {
String string = "Hello";
// you can call `mapBoo` like normal here
string = mapBoo(string);
System.out.println(string);
List<String> strings = Arrays.asList("Hello", "this", "is", "a", "test");
// or you can pass mapBoo into the stream.map method since map fits the method signature
List<String> mappedStrings = strings.stream().map(Main::mapBoo)
.collect(Collectors.toList());
for (String mappedString : mappedStrings)
System.out.println(mappedString);
}
static String mapBoo(String s) {
return s + "boo";
}
answered Nov 14 '18 at 19:55
xtraticxtratic
2,4971822
I have a string a = "Hello" initialized in the main class and when I call map from the main I want it to modify string a to "Helloboo"
– Joon1
Nov 14 '18 at 20:00
add a comment |
0
0
0
You cannot call map inside the static main method. You must make map a static method as well if you want to do that. Also we can't help you with what to put inside your map function if you don't tell us what it should do.
public static void main(String args) {
String string = "Hello";
// you can call `mapBoo` like normal here
string = mapBoo(string);
System.out.println(string);
List<String> strings = Arrays.asList("Hello", "this", "is", "a", "test");
// or you can pass mapBoo into the stream.map method since map fits the method signature
List<String> mappedStrings = strings.stream().map(Main::mapBoo)
.collect(Collectors.toList());
for (String mappedString : mappedStrings)
System.out.println(mappedString);
}
static String mapBoo(String s) {
return s + "boo";
}
answered Nov 14 '18 at 19:55
xtraticxtratic
2,4971822
You cannot call map inside the static main method. You must make map a static method as well if you want to do that. Also we can't help you with what to put inside your map function if you don't tell us what it should do.
public static void main(String args) {
String string = "Hello";
// you can call `mapBoo` like normal here
string = mapBoo(string);
System.out.println(string);
List<String> strings = Arrays.asList("Hello", "this", "is", "a", "test");
// or you can pass mapBoo into the stream.map method since map fits the method signature
List<String> mappedStrings = strings.stream().map(Main::mapBoo)
.collect(Collectors.toList());
for (String mappedString : mappedStrings)
System.out.println(mappedString);
}
static String mapBoo(String s) {
return s + "boo";
}
answered Nov 14 '18 at 19:55
xtraticxtratic
2,4971822
edited Nov 14 '18 at 20:05
answered Nov 14 '18 at 19:55
xtraticxtratic
2,4971822
answered Nov 14 '18 at 19:55
xtraticxtratic
2,4971822
answered Nov 14 '18 at 19:55
xtraticxtratic
2,4971822
2,4971822
I have a string a = "Hello" initialized in the main class and when I call map from the main I want it to modify string a to "Helloboo"
– Joon1
Nov 14 '18 at 20:00
add a comment |
I have a string a = "Hello" initialized in the main class and when I call map from the main I want it to modify string a to "Helloboo"
– Joon1
Nov 14 '18 at 20:00
I have a string a = "Hello" initialized in the main class and when I call map from the main I want it to modify string a to "Helloboo"
– Joon1
Nov 14 '18 at 20:00
I have a string a = "Hello" initialized in the main class and when I call map from the main I want it to modify string a to "Helloboo"
– Joon1
Nov 14 '18 at 20:00
add a comment |
0
You want to modify a String with a given StringTransformation so you need to pass both of them to the map method. Also you can turn addBlah in a more simple lambda :
public static void main(String args) {
StringTransformation addBlah = (e) -> e + "boo";
String str = "Hello";
System.out.println(str); // Hello
str = map(addBlah, str);
System.out.println(str); // Helloboo
}
static String map(StringTransformation t, String argument) {
return t.transf(argument);
}
answered Nov 14 '18 at 20:06
azroazro
11.3k41638
add a comment |
0
You want to modify a String with a given StringTransformation so you need to pass both of them to the map method. Also you can turn addBlah in a more simple lambda :
public static void main(String args) {
StringTransformation addBlah = (e) -> e + "boo";
String str = "Hello";
System.out.println(str); // Hello
str = map(addBlah, str);
System.out.println(str); // Helloboo
}
static String map(StringTransformation t, String argument) {
return t.transf(argument);
}
answered Nov 14 '18 at 20:06
azroazro
11.3k41638
add a comment |
0
0
0
You want to modify a String with a given StringTransformation so you need to pass both of them to the map method. Also you can turn addBlah in a more simple lambda :
public static void main(String args) {
StringTransformation addBlah = (e) -> e + "boo";
String str = "Hello";
System.out.println(str); // Hello
str = map(addBlah, str);
System.out.println(str); // Helloboo
}
static String map(StringTransformation t, String argument) {
return t.transf(argument);
}
answered Nov 14 '18 at 20:06
azroazro
11.3k41638
You want to modify a String with a given StringTransformation so you need to pass both of them to the map method. Also you can turn addBlah in a more simple lambda :
public static void main(String args) {
StringTransformation addBlah = (e) -> e + "boo";
String str = "Hello";
System.out.println(str); // Hello
str = map(addBlah, str);
System.out.println(str); // Helloboo
}
static String map(StringTransformation t, String argument) {
return t.transf(argument);
}
answered Nov 14 '18 at 20:06
azroazro
11.3k41638
answered Nov 14 '18 at 20:06
azroazro
11.3k41638
answered Nov 14 '18 at 20:06
azroazro
11.3k41638
answered Nov 14 '18 at 20:06
azroazro
11.3k41638
11.3k41638
add a comment |
add a comment |
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With out the interface definition it's hard to say. Please include the code for the interface.
– markspace
Nov 14 '18 at 19:38
1
You pass an instance of a class that has implemented said interface.
– KevinO
Nov 14 '18 at 19:38
@markspace Sorry I forgot, I added it now
– Joon1
Nov 14 '18 at 19:39
1
Also, unless I missed something,
mapwill need to bestaticto be called frommain.– KevinO
Nov 14 '18 at 19:40
Aside: you can simply use
e -> e += "boo"as your lambda declaration. No need for braces or return, sincea += bis an expression.– Andy Turner
Nov 14 '18 at 19:42