filter minimum value from custom java array list

» java » filter minimum value from custom java array list

By : user3044556

Date : December 01 2020, 04:47 PM

this one helps. You can try to do that by streaming the ArrayList like this:
Java 8 and higher:

code :

List<UserDeactivationThreshold> thresholds = new ArrayList<>();

// fill the list somehow

// then stream for minimum thresholdValue:
UserDeactivationThreshold minThreshold = thresholds..stream()
                .min(Comparator.comparing(UserDeactivationThreshold::getThresholdValue))
                .get()

public static UserDeactivationThreshold getMinimumThresholdFor(String roleName, List<UserDeactivationThreshold> thresholds) {
    List<UserDeactivationThreshold> mins = new ArrayList<>();

    // first, fetch all items with the given role name into a list
    for (int i = 0; i < thresholds.size(); i++) {
        UserDeactivationThreshold udt = thresholds.get(i);

        if (udt.getRoleName().equals(roleName)) {
            mins.add(udt);
        }
    }

    // then create an instance to be returned, initialized with null
    UserDeactivationThreshold min = null;

    // now go through the list of items with the given role name
    for (int i = 0; i < mins.size(); i++) {
        // take the current item
        UserDeactivationThreshold current = mins.get(i);
        // check if minimum is still null
        if (min == null) {
            // if yes, set the minimum to the current item
            min = current;
        // if it is not null anymore, compare min's threshold to current's
        } else if (min.getThreshold() > current.getThreshold()) {
            // and set min to current if current has a lower threshold
            min = current;
        }
    }

    return min;
}

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How to filter a list with linq depends on counting a property at the same list and take a random group at least minimum

By : Etienne Marais

Date : March 29 2020, 07:55 AM

like below fixes the issue Not sure how you wanted the null vlanids handled... Did you never want to return those? If so, just add a .Where(v=>v.vlandid!=null) at the end of the other Where clauses. The code supplied is able to be dropped into LinqPad (using statements). Feel free to play with it as needed.

code :

var ips= new[]{
  new {ip="100.100.101",VLanID=(int?)100,isReserved=0,PackageId=0},
  new {ip="100.100.102",VLanID=(int?)100,isReserved=0,PackageId=0},
  new {ip="200.200.201",VLanID=(int?)200,isReserved=0,PackageId=0},
  new {ip="200.200.202",VLanID=(int?)200,isReserved=0,PackageId=1},
  new {ip="300.300.301",VLanID=(int?)null,isReserved=0,PackageId=0},
  new {ip="300.300.302",VLanID=(int?)null,isReserved=0,PackageId=0},
  new {ip="400.400.401",VLanID=(int?)400,isReserved=0,PackageId=0},
  new {ip="400.400.402",VLanID=(int?)400,isReserved=0,PackageId=0}
};
var numOfIps=2;
var result=ips.GroupBy(k=>k.VLanID)
 .Where(v=>v.Count()>=numOfIps)
 .Where(v=>v.All(i=>i.isReserved==0))
 /*.Where(v=>v.Key!=null)  Remove null vlans */
 /*.OrderBy(x => Guid.NewGuid()) Pseudo Randomize */
 .First(v=>v.All(i=>i.PackageId==0))
 .Select(v=>v);

result.Dump();

Can I filter out duplicates within an array list using hashset in Java without distorting the order of the array?

By : mdwfp

Date : March 29 2020, 07:55 AM

hope this fix your issue What you are are looking for is a Collection that maintains insertion order and does not allow duplicates.
Thankfully, there is one available in the form of a LinkedHashSet

java: searching for the minimum in a 2d array and giving back the position of the minimum (row and coumn)

By : Mya

Date : March 29 2020, 07:55 AM

this one helps. Indxing in Java is 0-based, so you are ignoring the first row completely. After that you are ignoring all the elements in the first column except excelMatrix[1][1]. The correct implementation will be:

code :

double lowest = Double.parseDouble(excelMatrix[0][0]);
int row = 0, column = 0;

for(int r = 0; r< excelMatrix.length; r++) {
    for(int c = 0; c<excelMatrix[r].length; c++) {
        double number = Double.parseDouble(excelMatrix[r][c]);
        if(lowest > number) {
            lowest = number;
            row = r, column = c;
        }
    }
}
System.out.print(lowest + " at row: " + row + "and column: " + column);

I need to use java 8 filter to filter my list of custom objects in efficient manner

By : Dave

Date : March 29 2020, 07:55 AM

Does that help The code below is in java 6. How to code it in java 8 using streams and functional capabilities ? , The equivalent of your code in Java 8 would be :

code :

public static void main(String[] args) {

    List<FileTransAuditInfo> workRequestFileTransAuditList = new ArrayList<>();

    final String type1 = "type 1";
    final String type2 = "type 2";

    List<FileTransAuditInfo> workRequestFileTransAuditListforSubmission = workRequestFileTransAuditList.stream()
            .filter(file -> file.getFileEventType().equalsIgnoreCase(type1) || file.getFileEventType().equalsIgnoreCase(type2)) 
            .collect(Collectors.toList());

}

Filter Custom Objects in Array list or List

By : Mohaned Derar

Date : March 29 2020, 07:55 AM

wish of those help You can use retrolambda library to get Java 8 stream similar functions:

code :

List<Student> filteredList = StreamSupport
            .stream(yourInputStudentList)
            .filter(item -> item.getAge() == "20")
            .collect(Collectors.toList());

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.4.0'
        classpath 'me.tatarka:gradle-retrolambda:3.2.0' // Add this         
    }
}