Question

I am unsure how to add the following methods onto this code?? please help

- rowValuesIncrease(int[][] t) A method that returns true if from left to right in any row, the integers are increasing, otherwise false.

- columnValuesIncrease(int[][] t) A method that returns true if from top to bottom in any column, the integers are increasing, otherwise false.

- isSetOf1toN(int[][] t) A method that returns true if the set of integers used is {1, 2, . . . , n} where n is the number of cells, otherwise false. So, for example, if there are 10 cells the numbers would be 1, 2, . . . , 10 with no missing or duplicate numbers.

The code is;

public class Table {

/**
* The main method is just used for testing.
* @param args command line arguments are not used.
*/
public static void main(String[] args) {
final int[][] valid = {{1, 4, 5, 10, 11}, {2, 6, 8}, {3, 9, 12}, {7}};
System.out.println(Table.toString(valid));
System.out.println(Table.rowsLengthsDecrease(valid));
}

/**
* Determines whether the array passed to it is a valid table or not.
* @param t a two-dimensional array to test for table.
* @return true if the parameter is a valid table, otherwise false
*/
public static boolean isTable(int[][] t){
return false;
}

/**
* Returns a string representation of an array based table.
* @param t a two-dimensional array which represents a table.
* @return a string representation of an array based table.
*/
public static String toString(int[][] t) {
StringBuilder result = new StringBuilder();
for (int i = 0; i < t.length; i++) {
for (int j = 0; j < t[i].length; j++) {
result.append(String.format("%-4s", t[i][j]));
}
if (i < t.length-1) {
result.append("\n");
}
}
return result.toString();
}
/**
* returns true if no row is longer than row preceding, otherwise
* returns false.
* @param t a 2-D array which represents a table
* @return a boolean true or false value
*/
public static boolean rowsLengthsDecrease (int [][] t){
int shortest = t[0].length;
for(int i=0; i<t.length; i++){
if(t[i].length <= shortest){
shortest = t[i].length;
}else{
return false;
}
}
return true;
  
}

Answer 1

PLEASE GIVE IT A THUMBS UP :-)

class Table {

/**
* The main method is just used for testing.
* @param args command line arguments are not used.
*/
public static void main(String[] args) {
final int[][] valid = {
{
1, 4, 5, 10, 11
}, {
2, 6, 8, 9
}, {
3, 9, 12
}, {
7
}
};
System.out.println(Table.toString(valid));
System.out.println(Table.rowsLengthsDecrease(valid));
System.out.println(Table.rowValuesIncrease(valid));
System.out.println(Table.columnValuesIncrease(valid));
System.out.println(Table.isSetOf1toN(valid));
}

static boolean rowValuesIncrease(int[][] t) {
   for(int i=0;i<t.length;i++){
       int flag=0;
       for(int j=1;j<t[i].length;j++){
           if(t[i][j]<t[i][j-1])
               flag=1;
       }
       if(flag==0)
           return true;
   }
   return false;
}

static boolean columnValuesIncrease(int[][] t){
   for(int i=0;i<t.length;i++){
       int flag=0;
       for(int j=0;j<t[i].length;j++){
           try{
               if(t[j][i]>t[j][i+1])
                   flag=1;
           }
           catch(Exception e){}
       }
       if(flag==0)
           return true;
   }
   return false;
}

static boolean isSetOf1toN(int[][] t){
   int n=0;
   for(int i=0;i<t.length;i++){
       n+=t[i].length;
   }
   boolean f[] = new boolean[n];
   for(int i=0;i<n;i++)
       f[i]=false;
   for(int i=1;i<=n;i++){
       for(int j=0;j<t.length;j++){
           for(int k=0;k<t[j].length;k++){
               if(t[j][k]==i){
                   if(f[i-1]==false)
                       return false;
                   f[i-1]=true;
               }
           }
       }
   }
   for(int i=0;i<n;i++)
   {
       if(f[i]==false)
           return false;
   }
   return true;
}

/**
* Determines whether the array passed to it is a valid table or not.
* @param t a two-dimensional array to test for table.
* @return true if the parameter is a valid table, otherwise false
*/
public static boolean isTable(int[][] t) {
return false;
}

/**
* Returns a string representation of an array based table.
* @param t a two-dimensional array which represents a table.
* @return a string representation of an array based table.
*/
public static String toString(int[][] t) {
StringBuilder result = new StringBuilder();
for (int i = 0; i<t.length; i++) {
for (int j = 0; j<t[i].length; j++) {
result.append(String.format("%-4s", t[i][j]));
}
if (i<t.length - 1) {
result.append("\n");
}
}
return result.toString();
}
/**
* returns true if no row is longer than row preceding, otherwise
* returns false.
* @param t a 2-D array which represents a table
* @return a boolean true or false value
*/
public static boolean rowsLengthsDecrease(int[][] t) {
int shortest = t[0].length;
for (int i = 0; i<t.length; i++) {
if (t[i].length<= shortest) {
shortest = t[i].length;
} else {
return false;
}
}
return true;

}
}