How to Sort Lists of Objects with Multiple Fields in Java?

Sorting Lists of Objects with Multiple Fields:

In the initial sorting code provided, the concatenation of the fields in the comparison makes it challenging to separate the fields for sorting. To rectify this, consider adding spaces between the fields. Alternatively, you can explore the following alternatives:

Using Java 8 Lambdas:

Collections.sort(reportList, Comparator.comparing(Report::getReportKey)

    .thenComparing(Report::getStudentNumber)
    .thenComparing(Report::getSchool));

Reflective Method: BeanComparator:

ComparatorChain chain = new ComparatorChain(Arrays.asList(
new BeanComparator("size"),
new BeanComparator("nrOfToppings"),
new BeanComparator("name")));

Collections.sort(pizzas, chain);

Guava's ComparisonChain:

Collections.sort(pizzas, new Comparator() {

@Override  
public int compare(Pizza p1, Pizza p2) {  
    return ComparisonChain.start().compare(p1.size, p2.size).compare(p1.nrOfToppings, p2.nrOfToppings).compare(p1.name, p2.name).result();  
}  

});

Apache Commons CompareToBuilder:

Collections.sort(pizzas, new Comparator() {

@Override  
public int compare(Pizza p1, Pizza p2) {  
    return new CompareToBuilder().append(p1.size, p2.size).append(p1.nrOfToppings, p2.nrOfToppings).append(p1.name, p2.name).toComparison();  
}  

});

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