英文:
Why isn't the Boolean value recognized?
问题
public class HelloWorld {public static void main(string[] args) {boolean found;String[] caseArray = new caseArray {"apple", "orange", "mango", "pineapple"} ;for (int i = 0; i < caseArray.length; i++) {if (caseArray[i].equals("pineapple")) {found = true;break;} else {found = false;}}if (found == true) {System.out.println("product found");break;} else {System.out.print("product not found");break;}}}
英文:
public class HelloWorld {public static void main(string[] args) {boolean found;String[] caseArray = new caseArray {"apple", "orange", "mango", "pineapple"} ;for (int i = 0; i < caseArray.length; i++) {if (caseArray[i].equals("pineapple")) {found = true;break;} else {found = false;}}if (found == true) {System.out.println("product found");break;} else {System.out.print("product not found");break;}}}
In the above code I would like to return found = true when the for loop searches pineapple in the array. If found is equal to true I would like it to print "product found", if found = false I would like it to print "product not found".
答案1
得分: 1
我认为这个代码不会编译，因为你的布尔变量没有初始化。在长度为0的数组情况下，这个布尔值永远不会被初始化，而Java不允许这样做。
public class HelloWorld {public static void main(String[] args) {boolean found = false;String[] caseArray = new String[]{"apple", "orange", "mango", "pineapple"};for (int i = 0; i < caseArray.length; i++) {if (caseArray[i].equals("pineapple")) {found = true;break;} else {found = false;}}if (found == true) {System.out.println("product found");break;} else {System.out.print("product not found");break;}}}
英文:
I don't think this will compile, because of your uninitialized boolean variable. In the case of a 0 length array, the found boolean will never get initialed, and Java won't let you do that
public class HelloWorld{public static void main(string [] args){boolean found = false;String [] caseArray = new caseArray{"apple", "orange", "mango", "pineapple" };for(int i = 0; i< caseArray.length; i++){if(caseArray[i].equals(pineapple)){found = true;break;} else{found = false;}}if(found == true){System.out.println("product found");break;} else {System.out.print("product not found");break;}}}
答案2
得分: 1
你的代码没有正确遵循Java语法。
以下是可以正常工作的代码：
public class HelloWorld {public static void main(String[] args) {boolean found = false;String[] caseArray = new String[]{"apple", "orange", "mango", "pineapple"};for (int i = 0; i < caseArray.length; i++) {if (caseArray[i].equals("pineapple")) {found = true;break;}}if (found) {System.out.println("product found");} else {System.out.print("product not found");}}}
在你的帖子中，以下部分不符合语法：
首先，在你的代码中：
public static void main(string[] args) {
上述代码中，args应为String[]（首字母大写），而不是小写的string[]。
其次，在你的代码中：
String[] caseArray = new caseArray{...
这里，caseArray不是Java的类型，应该更新为以下形式：
String[] caseArray = new String[]{...
还有，在第三个问题中，我已将found的初始值设置为false，如果我们这样使用，就不需要在for循环中再次设置found = false。
英文:
Your code does not follow the java grammar correctly.
This will work.
public class HelloWorld{public static void main(String[] args){boolean found = false;String[] caseArray = new String[]{"apple", "orange", "mango", "pineapple" };for(int i = 0; i< caseArray.length; i++) {if(caseArray[i].equals("pineapple")) {found = true;break;}}if(found == true) {System.out.println("product found");} else {System.out.print("product not found");}}}
On your post, those are not following the grammar.
First, on your code
public static void main(string[] args) {
On above code, args is string[] (small s first) and it should be uppercase. (String[])
Second, on your code
String[] caseArray = new caseArray{...
Here, caseArray is not the java type and it should be updated as follows.
String[] caseArray = new String[]{...
And third, I have set the initial value of found to false and if we use like this, no need to set found = false in for query.
答案3
得分: 0
以下是已经翻译好的部分：
首先，代码中有几个语法问题。
- 字符串数组的初始化方式不正确
String[] caseArray = new caseArray{"apple", "orange", "mango", "pineapple"};
- 在
equals()方法的字符串比较部分有语法错误
if(caseArray[i].equals(pineapple)){
-
没有对布尔变量进行初始化，但在后面尝试使用了该变量。
-
break;关键字在if条件中的循环之外被使用。
我已经纠正了语法错误，以便您可以执行代码。
public class Test {public static void main(String[] args) {try {boolean found = false;String[] caseArray = { "apple", "orange", "mango", "pineapple" };for (int i = 0; i < caseArray.length; i++) {if (caseArray[i].equals("pineapple")) {found = true;break;}}if (found) {System.out.println("product found");// break;} else {System.out.print("product not found");// break;}} catch (Exception e) {e.printStackTrace();}}}
输出结果：
product found
英文:
First of all there are couple of syntax issue with this code.
-
the String array initialization is wrong
String [] caseArray = new caseArray{"apple", "orange", "mango", "pineapple" };
-
in
equals()check String has a syntax errorif(caseArray[i].equals(pineapple)){
-
didn't initialize the boolean but you try to use that variable later.
-
break;keyword is used outside a loop in anifcondition.
I have corrected the syntax so that you can execute it.
public class Test {public static void main(String[] args) {try {boolean found = false;String[] caseArray = { "apple", "orange", "mango", "pineapple" };for (int i = 0; i < caseArray.length; i++) {if (caseArray[i].equals("pineapple")) {found = true;break;}}if (found) {System.out.println("product found");// break;} else {System.out.print("product not found");// break;}} catch (Exception e) {e.printStackTrace();}}}
Output:
product found
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