Java basics to obtain system properties and environment variables

As the title says, the code is relatively simple and is written for novices. Veterans can read other articles!

public static void main(String[] args) {  
        //属性  
        System.out.println("系统属性......");  
        Properties props = System.getProperties();  
        Set<Object> sets = props.keySet();  
        for (Object objKey : sets) {  
            System.out.println("属性名：【"+objKey+"】\n属性值:"+props.getProperty((String) objKey)+"\n");  
        }  
          
          
        //环境变量  
        System.out.println("\n\n环境变量......");  
        Map<String, String> env = System.getenv();  
        Set<String> keySet = env.keySet();  
        for (String key : keySet) {  
            System.out.println("【"+key+"】\t:\t【"+env.get(key)+"】\n");  
        }  
          
    }

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