import java.util.Scanner; 
class Matice2
{
    static public void toto()
    {        
        Scanner scanner = new Scanner(System.in);
        System.out.printf("\f");
        
        int n=3;
        
        //System.out.printf("Matica stupna: ");       //tieto odkomentovane veci su pre nacitanie matice cez terminal
        //n=scanner.nextInt();                        //stupen stvorcovej matice
        double[][] matA = new double[n][n];
        
        //System.out.printf("Zadaj prvky matice %dx%d\n",n,n);
        
        /*for (int i=0;i<matA.length;i++)             //zadavanie prvkov matice
        {
            for(int j=0;j<matA[0].length;j++)
            {
                matA[i][j]=scanner.nextFloat();                
            }  
        }*/
        
        matA[0][0]= 1;          //napevno zadefinovane prvky matice
        matA[0][1]= 2;
        matA[0][2]= 3;
        matA[1][0]= 4;
        matA[1][1]= 5;
        matA[1][2]= 6;
        matA[2][0]= 7;
        matA[2][1]= 8;
        matA[2][2]= 9;       
        
        
        double[][] matAI = new double[n][n];          //diagonalna matica
        int j=0;
        int i=0;
      
        for (i=0;i<matAI.length;i++)                
        {
            for(j=0;j<matAI[0].length;j++)
            {
                if (i==j)
                    matAI[i][j]=1;
            }            
        }  
        
        for (i=0;i<matA.length;i++)                         //vypis matic
        {
            for(j=0;j<matA[0].length;j++)                   //vypis zadanej matice
            {
                System.out.printf("%3.0f",matA[i][j]);                
            }  
            System.out.printf(" |");
            
            for(j=0;j<matAI[0].length;j++)                  //vypis diagonalnej matice
            {
                System.out.printf("%3.0f",matAI[i][j]);                
            }          
            System.out.println();
        }   
    }
}

Line 1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'java'
Line 2: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Matice2'