having problem with returning an interface with two method

[hoangx87]

HI, I am having problem with return methods in an interface. I was wondering if anyone will be able to let me know what i have to type in an interface since there isn't parameter is illegal.

//(2) StudentStatisticCalculator.java
//An interface with two methods:
//getName(), which returns a String
//computeStatistic(Student[] students), which returns a double


public class Student{

String name;
double gpa;

public String getName(){
return name;
}

public double getGPA() {
return gpa;

}

}





public interface StudentStatisticCalculator{


public String getName();
String name=name;


public double computeStatistic(Student[]student();
return computestatistic;

}


following error:

StudentStatisticCalculator.java:15: ')' expected
public double computeStatistic(Student[]student();
^
StudentStatisticCalculator.java:15: illegal start of type
public double computeStatistic(Student[]student();
^
StudentStatisticCalculator.java:15: <identifier> expected
public double computeStatistic(Student[]student();
^
StudentStatisticCalculator.java:16: = expected
return computestatistic;
^
StudentStatisticCalculator.java:16: ';' expected
return computestatistic;
^
5 errors

[lovelesh]

Please go through the basics of Interface, things will become clear on its own.

You are making some very basic mistakes.

[sunde887]

As lovelesh said, these are basic basic mistakes, I suggest you start with
Trail: Learning the Java Language (The Java™ Tutorials)

[hoangx87]

So I was able to fixed up the getName but the other method I have no idea.

//(2) StudentStatisticCalculator.java
//An interface with two methods:
//getName(), which returns a String
//computeStatistic(Student[] students), which returns a double



public interface StudentStatisticCalculator{


public void getName();


public void computeStatistic(Student[]student());

}
}


StudentStatisticCalculator.java:14: ')' expected
public void computeStatistic(Student[]student());
^
StudentStatisticCalculator.java:14: illegal start of type
public void computeStatistic(Student[]student());
^
StudentStatisticCalculator.java:14: <identifier> expected
public void computeStatistic(Student[]student());
^
StudentStatisticCalculator.java:14: = expected
public void computeStatistic(Student[]student());
^
StudentStatisticCalculator.java:14: ';' expected
public void computeStatistic(Student[]student());
^
5 errors

----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.


Where will i be able to look up basic of interface anyway?

[pbrockway2]

Be careful.

The comment:

//(2) StudentStatisticCalculator.java
//An interface with two methods:
//getName(), which returns a String
//computeStatistic(Student[] [color=blue][b]students[/b][/color]), which returns a [color=red][b]double[/b][/color]

The code:

public [color=red][b]void[/b][/color] computeStatistic(Student[][color=blue][b]student()[/b][/color]);

These things can be confusing at first - keep your textbooks and notes handy!