Thread: Problem with string [...]

Hello, I am new to Java and I've got a problem already.
The program should copy person with the highest percent from the file 'plik1', and then put it to the file 'plik2'.
The problem occurs while compiling.

Thank you for understanding and your help,

fkmk

Compilator:

	string cannot be resolved to a type
	string cannot be resolved to a type
	string cannot be resolved to a type
	string cannot be resolved to a type
	string cannot be resolved to a type
	string cannot be resolved to a type
	string cannot be resolved to a type
	string cannot be resolved to a type

Code:

package zadanie2;
import java.util.*;
import java.io.*;
 
public class zadanie2 {
	public static void main(String[] args) throws Exception {
		Scanner plik1 = new Scanner(new File("plik.txt"));
		plik1.useLocale(Locale.US);
		PrintWriter plik2 = new PrintWriter("plik_max.txt");
 
		Person person[] = new Person[5];
 
		System.out.println("List of people:");
 
		while(plik1.hasNext()) {
			for(int counter=0; counter<5; counter++) {
			person[counter].name = plik1.next();
			person[counter].surname = plik1.next();
			person[counter].age = plik1.nextInt();
			person[counter].percent = plik1.nextFloat();
			System.out.println("%s %s %d %f", person[counter].name, person[counter].surname, person[counter].age, person[counter].percent);
			counter++;
			}
 
			int counter = 0;
	        float maximum = person[0].percent;
 
	        for(counter=1; counter<5; counter++) {
	        if(person[counter].percent > maximum)
	        maximum = person[counter].percent;
	        }
 
	        char badge = '*';
 
	        for(counter=0; counter<5; counter++) {
	            if((person[counter].name.length() > 3) && (person[counter].surname.lastIndexOf("ski")) && (person[counter].percent == maximum)) {
	            plik2.print(person[counter].name); plik2.print(person[counter].surname); plik2.println(person[counter].age);
	            } }
		}
		plik1.close();
		plik2.close();
	}
}
 
class Person {
    public :
         string name;
         string surname;
         int age;
         float percent;
}

Welcome to the forum! Thanks for taking the time to learn how to post code correctly. If you haven't already, please read this topic to learn other useful info for new members.

Java is case sensitive. 'string' is not the same as 'String'.

By convention, class names in Java begin with capital letters.

Firstly thanks for your replies.
Norm, I know, but I needed a quick reply. Sorry for that.

I fixed the code, but another problem occured. Could you please take a look at this?
Thanks in advance.

fkmk

Compilator:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	The operator && is undefined for the argument type(s) int, boolean
 
	at zadanie2.zadanie2.main(zadanie2.java:36)

Code:

package zadanie2;
import java.util.*;
import java.io.*;
 
public class zadanie2 {
	public static void main(String[] args) throws Exception {
		Scanner plik1 = new Scanner(new File("plik.txt"));
		plik1.useLocale(Locale.US);
		PrintWriter plik2 = new PrintWriter("plik_max.txt");
 
		Person person[] = new Person[5];
 
		System.out.println("List of people:");
 
		while(plik1.hasNext()) {
			for(int counter=0; counter<5; counter++) {
			person[counter].name = plik1.next();
			person[counter].surname = plik1.next();
			person[counter].age = plik1.nextInt();
			person[counter].percent = plik1.nextFloat();
			System.out.println("%s %s %d %f", person[counter].name, person[counter].surname, person[counter].age, person[counter].percent);
			counter++;
			}
 
			int counter = 0;
	        float maximum = person[0].percent;
 
	        for(counter=1; counter<5; counter++) {
	        if(person[counter].percent > maximum)
	        maximum = person[counter].percent;
	        }
 
	        char badge = '*';
 
	        for(counter=0; counter<5; counter++) {
	            if((person[counter].name.length() > 3) && (person[counter].surname.lastIndexOf("ski")) && (person[counter].percent == maximum)) {
	            plik2.print(person[counter].name); plik2.print(person[counter].surname); plik2.println(person[counter].age);
	            } }
		}
		plik1.close();
		plik2.close();
	}
}
 
class Person {
    private :
         String name;
         String surname;
         int age;
         float percent;
}

Originally Posted by Norm

Posting at multiple sites is allowed. Just tell us so we don't waste time answering a question that has been answered.

The AND operator && is for boolean operands. To get a boolean operand from an int value, compare it: x != 0

Ok, I understand. Sorry for that.

I fixed the code following your tips guys, but now compilator shows:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
 
	at zadanie2.zadanie2.main(zadanie2.java:6)

Code:

package zadanie2;
import java.util.*;
import java.io.*;
 
public class zadanie2 {
	public static void main(String[] args) throws Exception {
		Scanner plik1 = new Scanner(new File("plik.txt"));
		plik1.useLocale(Locale.US);
		PrintWriter plik2 = new PrintWriter("plik_max.txt");
 
		Person person[] = new Person[5];
 
		System.out.println("List of people:");
 
		while(plik1.hasNext()) {
			for(int counter=0; counter<5; counter++) {
			person[counter].name = plik1.next();
			person[counter].surname = plik1.next();
			person[counter].age = plik1.nextInt();
			person[counter].percent = plik1.nextFloat();
			System.out.printf("%s %s %d %f", person[counter].name, person[counter].surname, person[counter].age, person[counter].percent);
			counter++;
			}
 
			int counter = 0;
	        float maximum = person[0].percent;
 
	        for(counter=1; counter<5; counter++) {
	        if(person[counter].percent > maximum)
	        maximum = person[counter].percent;
	        }
 
	        char badge = '*';
	        String SubStr = new String("ski");
 
 
	        for(counter=0; counter<5; counter++) {
	            if((person[counter].surname.lastIndexOf(SubStr) != 0)  && (person[counter].percent == maximum) && (person[counter].name.length() > 3)) { 
	            plik2.print(person[counter].name); plik2.print(person[counter].surname); plik2.println(person[counter].age);
	            } } 
		}
		plik1.close();
		plik2.close();
	}
}

Thanks for all your pieces of advice!

Originally Posted by Norm

That does not say what the problem is. Did you leave off some of the error message?

No, I did not.

Norm, could you please tell me or give any tutorial, how to switch to javac compiler? I have looked up some sites, but haven't found any worth tips.

Norm, thank you.