Question with Arrays.asList ()
I have a very simple program and I just need to check an array for the value in it. I have a class called bulkBean. it's him.
public class bulkBean {
private int installmentNo;
private double amount;
public int getInstallmentNo() {
return installmentNo;
}
public void setInstallmentNo(int installmentNo) {
this.installmentNo = installmentNo;
}
public double getAmount() {
return amount;
}
public void setAmount(double amount) {
this.amount = amount;
}
}
Now I have an array of this bulkBean in my program, this is my program.
import java.util.Arrays;
public class test {
public static boolean scan_bulkList(bulkBean[] bulkList, int i) {
int[] arr = new int[bulkList.length];
for(int x=0;x<bulkList.length;x++){
arr[x] = bulkList[x].getInstallmentNo();
}
for(int j = 0; j< arr.length ;j++){
System.out.println("INFO: array "+j+" = "+arr[j]);
}
if (Arrays.asList(arr).contains(i) == true) {
return true;
} else {
return false;
}
}
public static void main(String[] arg){
bulkBean bb1 = new bulkBean();
bb1.setInstallmentNo(1);
bb1.setAmount(5500);
bulkBean bb2 = new bulkBean();
bb2.setInstallmentNo(2);
bb2.setAmount(4520);
bulkBean[] bulkArray = new bulkBean[2];
bulkArray[0] = bb1;
bulkArray[1] = bb2;
boolean a = scan_bulkList(bulkArray,1);
System.out.println("val = "+a);
}
}
I am creating 2 instances of the bean array and I am setting values for them. Then I added these two instances to the array. Then I pass this array to the method to check the value (also given as a parameter, in this case it is 1.). If the array contains this value, it must return true, otherwise false. whatever value i enter returns false. Why am I getting this problem?
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As TheListMind said Arrays.asList()
, taken on int[]
, gives you a list containing an array.
Personally, I would create a List directly instead of creating an array, or even better (without having to initialize the array), checking when iterating over the array of the array:
for(int x=0;x<bulkList.length;x++){
if (bulkList[x].getInstallmentNo() == i){
return true;
}
}
return false;
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The mistake you made here, you created an int array, which must be an Integer array, because that Arrays.asList().contains(Object o);
does the input parameter as well Integer(Integer i)
. int
is not an object Integer
. Hope it works.
int[] arr = new int[bulkList.length];
change to:
Integer[] arr = new Integer[bulkList.length];
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Modify the method as shown below to avoid complications:
public static boolean scan_bulkList(bulkBean[] bulkList, int i) {
int[] arr = new int[bulkList.length];
for(int x=0;x<bulkList.length;x++){
arr[x] = bulkList[x].getInstallmentNo();
if (bulkList[x].getInstallmentNo()==i) {
return true;
}
}
return false;
}
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