How to get minimum and maximum value from List of Objects using Java 8

Question

I have class like:

public class Test {
    private String Fname;
    private String Lname;
    private String Age;
    // getters, setters, constructor, toSt         


        

Answer 1

max age:

   testList.stream()
            .mapToInt(Test::getAge)
            .max();

min age:

   testList.stream()
            .mapToInt(Test::getAge)
            .min();

Answer 2

To simplify things you should probably make your age Integer or int instead of Sting, but since your question is about String age this answer will be based on String type.

---

Assuming that String age holds String representing value in integer range you could simply map it to IntStream and use its IntSummaryStatistics like

IntSummaryStatistics summaryStatistics = testList.stream()
        .map(Test::getAge)
        .mapToInt(Integer::parseInt)
        .summaryStatistics();

int max = summaryStatistics.getMax();
int min = summaryStatistics.getMin();