Buy and Sell Stock Only Multiple Times to Maximize Profit

package org.wesome.dsalgo;

import lombok.Data;

import java.util.ArrayList;
import java.util.stream.IntStream;

@Data
class Trading {
    int buy, sell;
}

class StockBuySell {
    static void stockBuySell(int trade[]) {
        // in order to buy and sell, trades must happen for at least two days
        if (trade.length < 2) {
            System.out.println("trading is required for at lest 2 days, but provided for " + trade.length + " days only.");
            return;
        }
        ArrayList<Trading> tradeDays = new ArrayList<>();
        int day = 0;
        while (day < trade.length - 1) {
            // assuming stock buy on day 1 then price must go up in order to sell, there must be altest 1 day where price must be lower then buy
            // find the day when today price is greater than tomorrow price
            while ((day < trade.length - 1) && (trade[day] >= trade[day + 1])) {
                day++;
            }

            // if no day is find, then cannot sell to make profit
            if (day == trade.length - 1) {
                break;
            }

//            we have reached here means there is altest 1 day where sell price is greater then buy price
            Trading e = new Trading();
            e.buy = day;
            day++;
            // Store the index of minima

//            loop untill we find a price which is higher then buy price and its next is lower then current

            while ((day < trade.length) && (trade[day] >= trade[day - 1])) {
                day++;
            }
            // Store the index of maxima
            e.sell = day - 1;
            tradeDays.add(e);
        }

        if (tradeDays.isEmpty())
            System.out.println("There is no day when buying the stock will make profit");
        else
            IntStream.range(0, tradeDays.size()).mapToObj(j -> "Buy on day: " + tradeDays.get(j).buy + " Sell on day : " + tradeDays.get(j).sell).forEach(System.out::println);
        return;
    }
}

package org.wesome.dsalgo;

import org.junit.jupiter.api.Test;

public class StockBuySellTest {
    @Test
    void stockBuySell1() {
        StockBuySell.stockBuySell(new int[]{100, 180, 260, 310, 40, 535, 695});
    }

    @Test
    void stockBuySel2() {
        StockBuySell.stockBuySell(new int[]{10, 18, 26, 31, 4, 53, 69});
    }

    @Test
    void stockBuySel3() {
        StockBuySell.stockBuySell(new int[]{10, 18});
    }

    @Test
    void stockBuySel4() {
        StockBuySell.stockBuySell(new int[]{10});
    }
}

plugins {
    id 'org.springframework.boot' version '2.5.4'
    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'java'
}

group = 'org.wesome'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = JavaVersion.VERSION_1_8

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

dependencies {
    compileOnly 'org.projectlombok:lombok'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

test {
    useJUnitPlatform()
}