So I need to print an array of integers into a String, and I have it almost right with one problem
public static String arrayToString(int[] anArray) {
String x = "";
String y = "";
String result = "";
for (int i = 0; i < anArray.length; i++) {
y = Integer.toString(anArray[i]);
x = x + ", " + y;
}
result = "[" + x + "]";
return result;
}
public static void main(String[] args) {
int arrayInt[] = new int[] { 80, 100, 80, 92, 95, 87, 82, 76, 45, 76, 80, 70};
System.out.println("array : " + arrayToString(arrayInt));
}
When I execute the code, instead of printing:
[80, 100, 80, 92, 95, 87, 82, 76, 45, 76, 80, 70]
I get:
[, 80, 100, 80, 92, 95, 87, 82, 76, 45, 76, 80, 70]
This should be really simple to me but I'm stuck, where do I need to put an exception to remove it?
You are just adding an extra ,
in the beginning. One simple way to get rid of it is,
Replace
result = "[" + x + "]";
with
result = "[" + x.substring(1) + "]";
But the best solution would be to use Arrays.toString
. See this for more details.
The problem is that you are getting an extra comma ,
at the beginning. This will solve your problem in the arrayToString
function:
public static String arrayToString(int[] anArray) {
String x = "";
String y = "";
String result = "";
for (int i = 0; i < anArray.length-1; i++) {
y = Integer.toString(anArray[i]);
x = x + y + ",";
}
y = Integer.toString(anArray[anArray.length-1]);
x = x + y;
result = "[" + x + "]";
return result;
}
public static String arrayToString(int[] anArray) {
String x = "";
String y = "";
String result = "";
for (int i = 0; i < anArray.length; i++) {
y = Integer.toString(anArray[i]);
if(x.isEmpty()){
x = y;
} else {
x = x + ", " + y;
}
}
result = "[" + x + "]";
return result;
}
public static void main(String[] args) {
int arrayInt[] = new int[] { 80, 100, 80, 92, 95, 87, 82, 76, 45, 76, 80, 70 };
System.out.println("array : " + arrayToString(arrayInt));
}
您可以包括检查第一个元素。
if( i == 0 ) x = y; else x = x + ", " + y;
Please change the last line in your code, result string variable as below:
public static String arrayToString(int[] anArray) {
String x = "";
String y = "";
String result = "";
for (int i = 0; i < anArray.length; i++) {
y = Integer.toString(anArray[i]);
x = x + ", " + y;
}
result = "[" + x + "]";
return result.charAt(0)+result.substring(3);
}
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