Different Ways to Iterate over a Set in Java

最新推荐文章于 2024-07-29 16:52:29 发布

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本文通过一个具体的Java程序示例，展示了多种遍历集合的方法，包括增强for循环、基本迭代器循环、while迭代器循环以及JDK8引入的流式处理等。每种方法都通过打印集合中的汽车名称来演示其用法。

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package com.sheting.basic.collection.iterate;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

public class SetIterateProgram {
    public static void main(String... args) {

        Set<String> cars = new HashSet<String>();
        cars.add("DeLorean DMC-12 1982");
        cars.add("corvette stingray 1960");
        cars.add("mustang fastback 1967");

        // Enhanced for loop
        for (String car : cars) {
            carPrinter(car);
        }

        // Basic loop with iterator
        for (Iterator<String> it = cars.iterator(); it.hasNext();) {
            carPrinter(it.next());
        }

        // While loop with iterator
        Iterator<String> it = cars.iterator();
        while (it.hasNext()) {
            String car = it.next();
            carPrinter(car);
        }

        // JDK 8 streaming example lambda expression
        cars.stream().forEach(color -> carPrinter(color));

        // JDK 8 streaming example method reference
        cars.stream().forEach(SetIterateProgram::carPrinter);

        // JDK 8 for each with lambda
        cars.forEach(color -> carPrinter(color));

        // JDK 8 for each
        cars.forEach(SetIterateProgram::carPrinter);

    }

    private static void carPrinter(String car) {
        System.out.println(car);
    }

}