Java数组存储值

Question

I'm trying to store the values inputted on the for-loop structure that I will need for later use, but it can only be recognized inside the for loop structure. I need the stored values to be recognize for the rest of the program but somehow I'm getting an error "cannot find symbol"

public class TryArray {
  public static void main(String args[]) throws IOException {
    BufferedReader inpt = new BufferedReader(new InputStreamReader(System. in ));

    int[] arrayCrit = new int[5];
    String[] crits = new String[5];

    for (int i = 0; i < crits.length; i++) {
      System.out.print("Criteria: ");
      crits[i] = inpt.readLine();
      for (int j = 0; j < arrayCrit.length; j++) {
        System.out.print("Percentage: ");
        arrayCrit[j] = Integer.parseInt(inpt.readLine());
      }
    }

    System.out.println(crits[i] + arrayCrit[j])
  }
}

Edit: Yes, I can move the print output inside the for-loop, but I need to input all the values first before showing all of it. Please I need help.

Answer 1

to show all you have to make another loop to read, after the insertion

import java.io.*;

public class TryArray{
    public static void main(String args[])throws IOException{
    BufferedReader inpt = new BufferedReader (new InputStreamReader(System.in));

    int [] arrayCrit = new int [5];
    String [] crits = new String [5];

    for(int i=0; i<crits.length; i++){
        System.out.print("Criteria: ");
        crits[i]=inpt.readLine();
     for (int j=0; j<arrayCrit.length; j++){
        System.out.print("Percentage: ");
        arrayCrit[j]=Integer.parseInt(inpt.readLine());
     }
    }
    for(int i=0; i<crits.length; i++){
        for (int j=0; j<arrayCrit.length; j++){

            System.out.println(crits[i] + arrayCrit[j])
            }
        }
    }
}

or I misunderstood your question?

Answer 2

Hope this will help.

public static void main(String args[]) throws IOException {
    BufferedReader inpt = new BufferedReader(new InputStreamReader(
            System.in));

    int[] arrayCrit = new int[5];
    String[] crits = new String[5];

    for (int i = 0; i < crits.length; i++) {
        System.out.print("Enter Criteria: ");
        crits[i] = inpt.readLine();
        System.out.print("Enter Percentage: ");
        arrayCrit[i] = Integer.parseInt(inpt.readLine());
    }
    // Printing the values
    for (int i = 0; i < crits.length; i++) {
        System.out.println("Criteria :" + crits[i] + " Percentage: "
                + arrayCrit[i]);
    }
}

Answer 3

What you're currently doing will overwrite the values entered for the previous criteria when you get the input for the next. I believe you want to have a 2d array for arrayCrit to store all the percentages for each criteria. Only in such a scenario it makes sense to have 2 for loops.

String[] crits = new String[5];
int[][] arrayCrit = new int[5][5]; // The 2d array

for (int i = 0; i < crits.length; i++) {
    System.out.print("Criteria: ");
    crits[i] = inpt.readLine();
    for (int j = 0; j < arrayCrit[i].length; j++) {
        System.out.print("Percentage: ");
        arrayCrit[i][j] = Integer.parseInt(inpt.readLine()); // Inputting different set of percentage for each criteria
    }
}

// Displaying each criteria with its own percentages
for (int i = 0; i < crits.length; i++) {
    System.out.print("For Criteria: " + crits[i]+" ---> ");
    for (int j = 0; j < arrayCrit[i].length; j++) {
        System.out.print("Percentage " + j + " : " + arrayCrit[i][j] + "\t");
    }
    System.out.println();
}

Answer 4

1) Add

import java.io.*;  

2)You are using nested for loops

for(int i=0; i<crits.length; i++){ //this will execute 5 times
    System.out.print("Criteria: ");
    crits[i]=inpt.readLine();
 for (int j=0; j<arrayCrit.length; j++){ //this will execute 5 times for each i = 25 times
    System.out.print("Percentage: ");
    arrayCrit[j]=Integer.parseInt(inpt.readLine());
 }
}

Remove nested for-loop as

 for(int i=0; i<crits.length; i++){ //this will execute 5 times
    System.out.print("Criteria: ");
    crits[i]=inpt.readLine();
 }
 for (int j=0; j<arrayCrit.length; j++){ //this will execute 5 times 
    System.out.print("Percentage: ");
    arrayCrit[j]=Integer.parseInt(inpt.readLine());
 }  

3) can not find symbol
You want to print criteria and percentage at same time, as you have initialized both arrays with size 5, then you can directly print

 for (int i = 0; i < 5; i++) {    
   System.out.println(crits[i] + arrayCrit[i]);
}   

4)You can use following program which is enhanced version of your program

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;


public class TestArray {
public static void main(String args[]) throws IOException {
    BufferedReader
    inpt = new BufferedReader(new InputStreamReader(System. in ));

    System.out.println("How many records?");//ask for how many records
    int n = Integer.parseInt(inpt.readLine());// store in n

    int[] arrayCrit = new int[n];//create array with size n
    String[] crits = new String[n];

        //**as you mentioned in edit you want to take all the input before printing**      
    for (int i = 0; i < n; i++) 
    {
      System.out.print("Criteria: ");
      crits[i] = inpt.readLine();

      System.out.print("Percentage: ");
      arrayCrit[i] = Integer.parseInt(inpt.readLine());      
    }
        //print both arrays
    System.out.println("Criteria  \t  Percentage");
    for (int i = 0; i < n; i++) 
    {
        System.out.println(crits[i] + "\t"+arrayCrit[i]);
    }       
  }
}

Useful link

• Nested for

Answer 5

You have to define i and j outside the loop. Otherwise, you can only use them inside the loop:

int i;
int j;

int[] arrayCrit = new int[5];
String[] crits = new String[5];

for (i = 0; i < crits.length; i++) {
  System.out.print("Criteria: ");
  crits[i] = inpt.readLine();
  for (j = 0; j < arrayCrit.length; j++) {
    System.out.print("Percentage: ");
    arrayCrit[j] = Integer.parseInt(inpt.readLine());
  }
}