Kotlin to Java Code Conversion: SimpleDate Class

package com.alamkanak.weekview;

import java.util.Calendar;

public class SimpleDate {
    private final int year;
    private final int month;
    private final int dayOfMonth;

    public SimpleDate(int year, int month, int dayOfMonth) {
        this.year = year;
        this.month = month;
        this.dayOfMonth = dayOfMonth;
    }

    public SimpleDate(Calendar cal) {
        this.year = cal.get(Calendar.YEAR);
        this.month = cal.get(Calendar.MONTH);
        this.dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
    }

    @Override
    public String toString() {
        return year + "-" + month + "-" + dayOfMonth;
    }
}