Java中如何打印出所有环境变量呢?

java获取环境变量的实现思路

java获取环境变量的实现思路:
    使用System.getenv()
	   返回所有环境变量Map
Map<String, String> env = System.getenv();
	env.forEach((k, v) -> System.out.println(k + ":" + v));

package com.java265;
import java.util.Map;
public class TestClass {
    public static void main(String[] args) {
        Map<String, String> env = System.getenv();
        // Java 8
        //env.forEach((k, v) -> System.out.println(k + ":" + v));
 
        //循环map的遍历
        for (Map.Entry<String, String> entry : env.entrySet()) {
            System.out.println(entry.getKey() + " : " + entry.getValue());
        }
    }
}