Java is the 5th day

Today's Progate challenged Java. Java is a language that is somewhat familiar to me, as I often see it here and there.

But I have no idea about classes or methods. It feels like object-oriented. However, the expansion of IF and the usage of For and While are common to all languages, and it is almost the same to define variables, enter data, and reuse them. I sometimes think that the usage of {} and [] is different, but I thought that it was not as different as the Tsugaru dialect and the Hakata dialect. I feel that the beginner's clearing is getting better.

So, I thought I'd upload the app I made to Heroku and publish it, but it doesn't work at all. You have to study the movement on the server side. It was such a 5th day.

JavaⅠ

Java basics

Let's touch Java Java basics / strings Numerical value Numerical calculation String concatenation

Let's use variables

Variable definition Let's use variables Variable update Self-substitution Omission of self-assignment Roles of variables and precautions Let's handle decimals

Type conversion

Automatic type conversion Forced conversion

Comprehensive task

Let's challenge the challenge

JavaⅡ

Boolean value and conditional expression

Boolean value / comparison operator Comparison operator (2) Logical operator

Conditional branch

if statement  else, else if switch statement switch statement (2)

Iterative processing

while statement for statement  break, continue

Array

Let's use an array Overwriting elements of an array Array and repeat For statement for arrays

Let's challenge the challenge

Comprehensive task

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