idea模版

import java.util.ArrayList;

public class jiandanshiyong<nu> {
    //prsf
    private static final  nu;
    public static void main(String[] args) {
        //prsf

        //sout输出system.out.println
        System.out.println("this is my world");
        //soutv,输出变量
        int number=1;
        System.out.println("number = " + number);
        //或者xxx.sout
        System.out.println(number);
        //循环fori
        String[] arr=new String[]{"sa","sb","sc"};
        for (int i = 0; i < arr.length; i++) {
            System.out.println(i);
        }
        //增强for循环iter
        for (String s : arr) {
            System.out.println(s);
        }
        //常用for循环itar
        for (int i = 0; i < arr.length; i++) {
            String s = arr[i];
            System.out.println(s);
        }
        //list.for
        ArrayList arrayList=new ArrayList();
        arrayList.add(123);
        arrayList.add(456);
        for (Object o : arrayList) {

        }
        //list.fori
        for (int i = 0; i < arrayList.size(); i++) {

        }
        //list.forr
        for (int i = arrayList.size() - 1; i >= 0; i--) {
            
        }
    }
    public void method(){
        //ifn
        ArrayList arrayList=new ArrayList();
        if (arrayList == null) {

        }
        //inn
        if (arrayList != null) {

        }
        //*.null
        if (arrayList == null) {

        }
        //*.nn
        if (arrayList != null) {

        }
        //new 类名(.var或者ctrl+alt+v)
        //shift+f6选中并修改所有变量名
        //ctrl+w选中当前字
 
    }
}