JingPingCheng dingbuoyi

This is a quick guide to Kotlin programming language. The previous part of this guide is here

#Object Oriented

fun main(args : Array<String>) {
  class local (val x : Int)
  
  val y = local(10)
 println("${y.x}")

#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

	// Copyright 2012 Square, Inc.
	package com.squareup.widgets;

	import android.content.Context;
	import android.content.res.TypedArray;
	import android.util.AttributeSet;
	import android.widget.ImageView;

	/** Maintains an aspect ratio based on either width or height. Disabled by default. */
	public class AspectRatioImageView extends ImageView {

	#/bin/bash
	#-- Script to automate https://help.github.com/articles/why-is-git-always-asking-for-my-password

	REPO_URL=`git remote -v \| grep -m1 '^origin' \| sed -Ene's#.(https://[^[:space:]]).*#\1#p'`
	if [ -z "$REPO_URL" ]; then
	echo "-- ERROR: Could not identify Repo url."
	echo " It is possible this repo is already using SSH instead of HTTPS."
	exit
	fi

	import com.android.volley.toolbox.HurlStack;
	import com.squareup.okhttp.OkHttpClient;
	import java.io.IOException;
	import java.net.HttpURLConnection;
	import java.net.URL;

	/**
	* An {@link com.android.volley.toolbox.HttpStack HttpStack} implementation which
	* uses OkHttp as its transport.
	*/

	<!DOCTYPE html>
	<html>
	<head>
	<title>网页标题</title>
	</head>
	<body>
	网页内容
	</body>

	</html>

	#/bin/bash
	#-- Script to automate https://help.github.com/articles/why-is-git-always-asking-for-my-password
	# Forked from the original to do the opposite: Switch ssh repo urls to https
	# Original here: https://gist.github.com/m14t/3056747
	# Thanks to @m14t

	#origin or upstream
	REMOTE=${1-origin}

	REPO_URL=`git remote -v \| grep -m1 "^$REMOTE" \| sed -Ene's#.([email protected]:[^[:space:]]).*#\1#p'`

	/*
	* Copyright (C) 2015 Jake Wharton
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software

	package com.example.test.app;/*
	* Copyright (C) 2008 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software

	package acme.aws;

	import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
	import com.amazonaws.services.rds.auth.GetIamAuthTokenRequest;
	import com.amazonaws.services.rds.auth.RdsIamAuthTokenGenerator;
	import org.springframework.beans.factory.annotation.Value;
	import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
	import org.springframework.stereotype.Component;

	@Component