Java 数组存储值

Java Array Storing Values

提问by user2768501

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"

我正在尝试存储在 for 循环结构上输入的值以供以后使用，但它只能在 for 循环结构内识别。我需要为程序的其余部分识别存储的值，但不知何故我收到错误“找不到符号”

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.

编辑：是的，我可以在 for 循环内移动打印输出，但我需要先输入所有值，然后才能显示所有值。请我需要帮助。

采纳答案by Prabhakaran Ramaswamy

Hope this will help.

希望这会有所帮助。

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]);
    }
}

回答by X-Pippes

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

显示所有您必须loop在插入后重新阅读

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?

或者我误解了你的问题？

回答by luanjot

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

您必须在循环外定义 i 和 j。否则，您只能在循环内使用它们：

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());
  }
}

回答by SudoRahul

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 2darray for arrayCritto store all the percentages for each criteria. Only in such a scenario it makes sense to have 2 forloops.

当您获得下一个条件的输入时，您当前所做的将覆盖为前一个条件输入的值。我相信你想要一个2d数组arrayCrit来存储每个标准的所有百分比。只有在这种情况下，有 2 个for循环才有意义。

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();
}

回答by Aniket Kulkarni

1) Add

1) 添加

import java.io.*;  

2)You are using nested for loops

2）您正在使用嵌套的 for 循环

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

删除嵌套的 for 循环为

 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

3）can not find symbol
你想同时打印标准和百分比，因为你已经用大小5初始化了两个数组，然后你可以直接打印

 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

4）您可以使用以下程序，这是您程序的增强版本

 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

有用的链接

• Nested for

• 嵌套为