Java Comparable Example through it's compareTo() method

Key points on Comparable

• Comparable interface available since java 1.2
• Comparable interface exists in java.lang package
• As of latest OpenJDK 14 API doc, Comparable interface provides only one method: compareTo() refer https://download.java.net/java/early_access/jdk14/docs/api/java.base/java/lang/Comparable.html
• Comparable interface can be used to sort collection elements
• Comparable interface only provides a single sorting sequence
• Use Collections.sort(List) method for sorting

Output of this example

Before (Comparable) sort [5|EEE|555.55, 404|AAA|111.11, 305|CCC|333.33, 1|DDD|444.44, 2|BBB|222.22]

After (Comparable) sort by Id [1|DDD|444.44, 2|BBB|222.22, 5|EEE|555.55, 305|CCC|333.33, 404|AAA|111.11]