Why do I get a syntax error on array declaration?

Question

I am new to Java; can someone please explain to me why this gives me an error

Description Resource Path Location Type Syntax error on token ";", { expected after this token InsertionSort.java /Alghoritems/src/sort line 4 Java Problem

package sort;

public class InsertionSort {
    int[] polje = { -2, 5, -14, 35, 16, 3, 25, -100 };
    
    for(int firstUnsorted = 1; firstUnsorted < polje.length; firstUnsorted++) {
        int newElement = polje[firstUnsorted];
        int i;
        for (i = firstUnsorted; i > 0 && polje[i - 1] > newElement; i--) {
            
        }
    }
    
    for (int i = 0; i < polje.length; i++){
        int firstUnsorted = 1;
        int elemant;
        
    }
    

}

Apart from the answers, I would recommend you to learn the basics of the language before doing any sorting. That would really help in the future. — Vyom Yadav
– Vyom Yadav, Commented Feb 20, 2021 at 9:28

Hamza · Accepted Answer · 2021-02-20 09:25:35Z

Each Java application needs an entry point, so the compiler knows where to begin executing the application. In the case of Java applications, you need to wrap up your code in the main() method.

public class HelloWorld{

     public static void main(String []args){
        System.out.println("Hello World");
     }
}

Your code should be

package sort;
    
public class InsertionSort {
    public static void main (String[] args) {
        int[] polje = { -2, 5, -14, 35, 16, 3, 25, -100 };
        
        for(int firstUnsorted = 1; firstUnsorted < polje.length; firstUnsorted++) {
            int newElement = polje[firstUnsorted];
            int i;
            for (i = firstUnsorted; i > 0 && polje[i - 1] > newElement; i--) {
                
            }
        }
        
        for (int i = 0; i < polje.length; i++){
            int firstUnsorted = 1;
            int elemant;
            
        }
        
    }    
}

sai · Accepted Answer · 2021-02-18 09:21:15Z

1

Write code in the main method,then the error will not occur.

answered Feb 18, 2021 at 9:21

sai

71 bronze badge

Comments

Mark Rotteveel · Accepted Answer · 2021-02-20 09:01:12Z

First of all you have to understand that Java is a programming language that is full on object-oriented. Even when you want to do the simplest thing, you have to create a class with a main method inside. I suggest you start with the basics, before going in for implementations of more difficult algorithms.

package sort;

public class InsertionSort {
   
      public static void main(String[] args)
    {
        int[] polje = { -2, 5, -14, 35, 16, 3, 25, -100 };

        for(int firstUnsorted = 1; firstUnsorted < polje.length; firstUnsorted++) {
            int newElement = polje[firstUnsorted];
            int i;
            for (i = firstUnsorted; i > 0 && polje[i - 1] > newElement; i--) {

            }
        }

        for (int i = 0; i < polje.length; i++){
            int firstUnsorted = 1;
            int elemant;

        }
    }

}

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