[英]Do-While loop to fill out Array
I am currently working on a project that asked me to set up data entry. 我目前正在做一个要求我设置数据输入的项目。 In the data entry mode the user will be asked to enter the Scientists data in a loop. 在数据输入模式下,将要求用户循环输入科学家数据。 if the user responds with 'y' they will be prompted to enter another scientist. 如果用户回答“ y”,将提示他们输入另一位科学家。 The best way I can think to do this is with a do-while loop to fill the array until the user decides its over. 我认为最好的方法是使用do-while循环填充数组,直到用户决定结束为止。 I am having trouble with 我有麻烦
Here is what I have: 这是我所拥有的:
public class Scientist {
private String name;
private String field;
private String greatIdeas;
public static void main(String[] args) {
String scientists[] = new String[100];
int scientistCount = 0;
Scanner input = new Scanner(System.in);
do{
String answer;
System.out.println("Enter the name of the Scientist: ");
scientists[scientistCount]=input.nextLine();
System.out.println(scientistCount);
System.out.println("Would You like to add another Scientist?");
scientistCount++;
}
while(input.next().equalsIgnoreCase("Y"));
input.close();
}
}
always prefer to read input using nextLine() and then parse the string. 总是喜欢使用nextLine()读取输入,然后解析字符串。
Using next()
will only return what comes before a space. 使用next()
将仅返回空格之前的内容。 nextLine()
automatically moves the scanner down after returning the current line. 返回当前行后, nextLine()
自动将扫描仪向下移动。
A useful tool for parsing data from nextLine()
would be str.split("\\\\s+")
. 用于解析nextLine()
数据的有用工具将是str.split("\\\\s+")
。
public class Scientist {
private String name;
private String field;
private String greatIdeas;
public static void main(String[] args) {
String scientists[] = new String[100];
int scientistCount = 0;
Scanner input = new Scanner(System.in);
do{
String answer;
System.out.println("Enter the name of the Scientist: ");
scientists[scientistCount]=input.nextLine();
System.out.println(scientistCount);
System.out.println("Would You like to add another Scientist?");
scientistCount++;
}
while(input.nextLine().equalsIgnoreCase("Y"));
input.close();
}
}
Change while(input.next().equalsIgnoreCase("Y"));
更改while(input.next().equalsIgnoreCase("Y"));
to while(input.nextLine().equalsIgnoreCase("Y"));
到while(input.nextLine().equalsIgnoreCase("Y"));
Is this the solution that you mean 这是你的意思解决方案
String scientists[] = new String[100];
int scientistCount = 0;
Scanner input = new Scanner(System.in);
boolean again = true;
while(again){
System.out.println("Enter the name of the Scientist: ");
scientists[scientistCount]=input.nextLine();
scientistCount++;
System.out.println(scientistCount);
System.out.println("Would You like to add another Scientist? y/n");
if(!input.nextLine().equalsIgnoreCase("y")){
again = false;
}
}
input.close();
Another way to do it, which i find simpler is with an arraylist, and a regular while loop that breaks after you change a boolean. 我发现更简单的另一种方法是使用arraylist,并在更改布尔值后中断常规的while循环。 See following example: 请参见以下示例:
ArrayList<String> scientists = new ArrayList<String>();
Scanner input = new Scanner(System.in);
boolean keepGoing = true;
while(keepGoing){
System.out.println("Enter the name of the Scientist: ");
scientists.add(input.nextLine());
System.out.println("Would You like to add another Scientist? (y/n)");
if(input.nextLine().toLowerCase().equals("y")){continue;}
else{keepGoing = false;}
}
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