I would like to know how to write the substitution and display of values in a two-dimensional array in a separate for statement.

If you simply want to divide it into different for statements, I think you should do the following.

for(intx=1;x<s.length;x++){
    for(inty=1;y<s[x].length;y++){
        s[x][y]=x*y;
    }
}
for(intx=1;x<s.length;x++){
     for(inty=1;y<s[x].length;y++){
         System.out.println(s[x][y]);
     }
}

If you do the following, the data may be a little easier to see.

// Import java.utils.Arrays at the beginning of the file
import java.util.Arrays;

for(intx=1;x<s.length;x++){
    for(inty=1;y<s[x].length;y++){
        s[x][y]=x*y;
    }
}
for (double[]data:s) {
     System.out.println (Arrays.toString(data));
}

I don't understand the meaning of the question, but is it like this?
Replace (s=x*y) and display (System.out.println(s[x][y])) in separate for statements.

double[][]s=new double[7][6];

for(intx=0;x<s.length;x++){
    for(inty=0;y<s[x].length;y++){
        s=x*y;
    }
}

for(intx=0;x<s.length;x++){
    for(inty=0;y<s[x].length;y++){
        System.out.println(s[x][y]);
    }
}

It doesn't directly concern the subject, so I thought I would leave a comment, but the evaluation was not enough, so I will write it here.

Perhaps, the subscripts of the array do not start from 1, but from zero.
As litmon wrote, the counter variable used in the for statement should start at zero.

Of course, depending on the language, there may be specifications that start with subscript 1.
In that case, I think the termination condition part of the for statement will be n<=length instead of n<length.

We recommend that you check what is inside the array, such as specifying an array with a maximum value subscript for the output function, specifying 0 or specifying 1.

Probably, but under the current state, I think the number 0 (equivalent to the first one) of the array is uninitialized.