" In your text editor, create a new file and save it as "HelloWorld.java". HelloWorld is your class name and you will need your class name to be the same name as your file. The main method public static void main(String[] args) is the method that will be executed when the programming is running. This main method will have the same method declaration in every Java program. public class HelloWorld { public static void main(String[] args) { } } " System.out.println("Hello World."); Let's look at the components of this line: System tells the system to do something. out tells the system that we are going to do some output stuff. println stands for "print line," so we are telling the system to print a line in the output. The parentheses around ("Hello World.") means that the method System.out.println() takes in a parameter, which, in this case, is the String "Hello World." Note that there are some rules in Java that we have to adhere to: You must always add a semicolon at the end of every line. Java is case sensitive, so you must write method names, variable names, and class names in the correct case or you will get an error. Blocks of code specific to a certain method or loop are encased between curly brackets. Your final Hello World program should look like the following: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World."); } } Navigate to the folder where you saved HelloWorld.java and type in javac HelloWorld.java. This tells the Java compiler that you want to compile HelloWorld.java. If there are errors, the compiler will tell you what you did wrong. Otherwise, you shouldn't see any messages from the compiler. If you look at the directory where you have HelloWorld.java now, you should see HelloWorld.class. This the the file that Java will use to run your program. Finally, we get to run our program! In command prompt or terminal, type in java HelloWorld. This tells Java that you want to run the class HelloWorld. You should see "Hello World." show up in your console.
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One-sentence summary -- We will first create a program that prints "Hello World. Declare your class and your main method. Write the line of code that will print out "Hello World. Put it all together. Save your file and open up command prompt or terminal to compile the program. Run the program. Congratulations, you have made your first Java program!

To be really good at playing the violin, you've got to be able to hear the music you're playing and improvise with it, much like a jazz musician. This skill makes you and the music one and the same. You can hear it still going in your head even though you're playing different notes. Once you've got a piece down, try adding your own flair to it and seeing what happens. To experiment, start by playing the bassline of a song you know well. Then continue playing the line in your head while you improvise on top. It takes the piece to a whole new level and can be very liberating. In short, never trust your memory. You'll end up thinking to yourself, "I think yesterday I stopped somewhere around here...and I had an issue with this bit, but I can't really remember what it was." Clearly that's not going to do you much good. Instead, bring a notebook with you and after you're done, write down a summation of the day's practice. Then tomorrow you can pick up exactly where you left off. Write down anything that you think will be useful, whether it's a problem you're having or a method you found around the problem you're having that you don't want to forget. You could even log your time and plan out the week's schedule, too. At the end of each session, you deserve a reward. Spend your last ten minutes or so having fun. Take an easy piece and play it however you like. Turn it into a dirge, speed it up, and see just how different you can make it sound. Play a piece that makes you smile. Odds are you'll notice that it, too, is sounding better and better. Practicing something every day becomes a drag before long. This 10 minutes may seem like a bit of a waste, but in the long run, it could keep your spirits up. Ending on a high note will make it that much easier to come back to it tomorrow. And the day after that, and the day after that, and the day after that.
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One-sentence summary -- Work on your improvisational skills. Write down your progress. End with some fun time.

Aquatic newts need a proper aquarium set-up to live happily. A 10-gallon (38 L) tank is a good choice, but a larger tank is generally better. Don't place your newt in anything smaller. Newts do well when there are at least two in a tank. Consider getting two newts, which can live happily in a 10-gallon (38 L) tank. Though the newt is named an aquatic newt, they need both land and water in their aquarium. Consider making your aquarium 70% water and 30% land. The tank needs enough land area for your aquatic newt to come completely out of the water and onto the land. Slope aquarium gravel up towards one edge to create an island or place a large rock inside with a slope for your newt to climb up. Make sure the slope is not too slippery since newts sometimes have trouble climbing. The slope should be gradual instead of steep. Their feet can slip on steep slopes. Aquatic newts will spend most of their time in the water. Placing enough water in the tank helps ensure they stay healthy. The water should be at least 10 inches (35 cm) deep. The newt should be able to move around while completely submerged under the water. You should only use dechlorinated water. Chlorinated water or water with other chemicals can harm or kill your newt. To dechlorinate your water, use special reptile dechlorinating tablets which you can purchase online or at pet stores. You can also use spring water. You can buy spring water at any grocery store or supermarket. Never use water directly from the tap. The chemicals in it will kill your newt. If you're going to use water from the tap, you must let the water sit out in an open container for at least 48 hours or longer so that the chemicals can evaporate out of the tap water before adding it to your newt's tank. Washed aquarium gravel should be placed along the bottom of the tank. Place a layer of gravel that is two inches (5 cm) thick. You can gradually stack the gravel so it slopes out of the water to give your newt a place to get out of the water. Consider using large, smooth, round stones for gravel. Your newt won't be able to eat it and it won't be so sharp that it'll cut your newt's feet. Small aquarium gravel can be too small for a newt. Choose gravel or stones that are larger than your newt's feet. The water inside your newt's tank will get dirty, so you need to use a filter. The filter will depend on how much water is in the tank. Try to get the smallest filter you can to limit the strength of the flow. Smaller filters will need to be changed more often. You will need a lid for your aquarium. Newts are escape artists and will crawl out of any crack they can find. Use a screen lid to make sure there is enough ventilation for your newt. Make sure the mesh of the screen lid is small enough that your newt can't slide through. Newts need full spectrum lighting with UVB rays. It should be turned on for 10 to 12 hours each day. You can place it on a timer so your newt always gets the proper amount of light.
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One-sentence summary --
Buy an aquarium. Create the right ratio of water to land. Add enough water. Line the tank with gravel. Use a filter. Cover the tank with the appropriate lid. Provide a UVB light source.