MacOSX用のjdk-7u80-macosx-x64.dmgをダウンロードする。インストールする前に「java アンインストール mac」でググって現在のjavaをアンインストールする方法を探す。 java8をアンインストールした上でjava7をインストールする。.

The type of installation depends on your requirement and the platform that you choose to install.

When I try to download Java from Oracle I instead end up downloading a page telling me that I need agree to the OTN license terms. In order to download products from Oracle Technology.
CERT Forensics Tools i386 Third-Party jdk-8u221-linux-i586.rpm: Java Platform Standard Edition Development Kit: CERT Forensics Tools x8664 Third-Party jdk-8u221-linux-x64.rpm.

Installation Requirements and Related Tasks

To develop or run Java applications, download and install JDK.

Version-String Format

To understand the version-string scheme that is used to distinguish various JDK releases, see Version-String Format.

Installation

The JDK can be installed on the following platforms:

You can download JDK from Java SE Development Kit Downloads page.

For supported processors and browsers, see Oracle JDK Certified System Configurations.

The JDK documentation is a separate download. See Java SE Documentation.

Microsoft Windows

Installation of the JDK on Microsoft Windows Platforms: Instructions include steps to install the JDK on 64-bit Microsoft Windows operating systems.

Linux

Installation of the JDK on Linux Platforms: Instructions include installation from Archive binaries and Red Hat Package Manager (RPM).

macOS

The installation of the JDK 12 requires macOS 10.11 or later.

Installation of the JDK on macOS: Instructions include steps to install the JDK on the macOS platform.

To learn about the files and directories that are created after JDK installation, see Installed Directory Structure of JDK.

Jdk 7u80 Macosx X64 Dmg