idea 几个快捷操作

public class DemowuApplication {
       //这些也是从网上看的，做个记录
    public static void main(String[] args) {
        System.out.println("this is test maven");
        
        boolean flag = false;
        //自动 if
        if (flag) { //flag.if

        }

        if (!flag) { //flag.e

        }

        //自动for循环

        for (int i = 0; i < 10; i++) { //fori

        }
        //自动while循环
        while (flag) {//flag.while

        }

        //var 自动补全变量声明
//        String aa = new String();
        HashMap hashMap = new HashMap();// new HahMap().var

        //自动sout
        System.out.println("hello");//"hello".sout

        //自动 try catch
        try {
            int i =0; // int i=0;.try
        } catch (Exception e) {
            e.printStackTrace();
        }

        //list
        ArrayList list = new ArrayList<>();// new ArrayList= 0; i--) {//list.forr
            System.out.println(list.get(i));//list.get(i).sout
        }

        Iterator iterator = list.iterator();//list.iterator().var
        while (iterator.hasNext()) { //iterator.hasNext().while

        }

        SpringApplication.run(DemowuApplication.class, args);
    }


    public int testRetur(){
        //自动返回值
        return 10; // 10.return;
//        return 10;
    }

}