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To make this, it is extremely simple the only class you have to edit is EntitySnowball.java which is located inside of net.minecraft.entity.projectile. As shown in the image below.
Double click that and the file should open.
Scroll down and find the method called "onImpact"
Right after the squiggly brackets type this code:
Your method should look like this:
Run Minecraft, get some snowballs... and BOOM!