How to install openjdk 7 on ubuntu 18.04 [duplicate]

Today I try to install openjdk 7 on my ubuntu 18.04 system. It always install oracle-java8-installer instead openjdk 7. Please help me

apt-get install openjdk-7-jre

2 Answers

Here you got a very good answer with a step-by-step instruction:
Download it here from Oracle.

I have installed OpenJDK 1.7 on Ubuntu 18.04

Step 1. Install OpenJDK 1.7

sudo dpkg -i
sudo dpkg -i
sudo dpkg -i
sudo dpkg -i 

Step 2. Switch to OpenJDK 1.7

export PATH=/usr/lib/jvm/java-7-openjdk-amd64/bin:$PATH

Note: If you want to use javac command instead of openjdk 1.7, use below command

sudo update-alternatives --config java