Java Taskbook Level 5.9

Display the following pyramid on the screen:

Given an array:

java{
  "123",
  "213",
  "321",
}

Replace the characters "1" with "0" in each line:

java{
  "023",
  "203",
  "320",
}

Given a number:

javaint num = 12345;

Double the digits in this number:

java1122334455

Given an array:

java{
  "text1",
  "text2",
  "text3",
  "text4",
  "text5"
}

Make a line out of this array so that each element of the array is on a new line:

java"""
  text1
  text2
  text3
  text4
  text5
"""