IoTest.java

package com.tfnico.examples.guava;

import com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.io.Closeables;
import com.google.common.io.Files;
import com.google.common.io.Flushables;
import com.google.common.io.Resources;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.URL;

import static org.junit.Assert.assertEquals;


public class IoTest {

	@Test
	public void messAroundWithFile() 
	{
		File file = new File("woop.txt");
		try {
			Files.touch(file);
			
			Files.write("Hey sailor!", file, Charsets.UTF_8);
			
			//Breakpoint here.. have a look at the file..
			
			Files.toByteArray(file);
			Files.newInputStreamSupplier(file);
			assertEquals("Hey sailor!", Files.readFirstLine(file, Charsets.UTF_8));
			assertEquals("Hey sailor!", Files.toString(file, Charsets.UTF_8));
		
			Files.deleteRecursively(file);
			
		} catch (IOException e) {
			Throwables.propagate(e);
		}
	}
	
	
	@Test
	public void closingAndFlushing() 
	{
		InputStream inputStream = System.in;
		try {
			inputStream.close();//The old way
		} catch (IOException e) {
			Throwables.propagate(e);
		}
		Closeables.closeQuietly(inputStream ); //The new way
		
		//Or flush:
		PrintStream outputStream = System.out;
		Flushables.flushQuietly(outputStream);
	}
	
	@Test
	public void classPathResources() 
	{
		//This:
		Resources.getResource("com/tfnico/examples/guava/BaseTest.class");
		
		//instead of this:
		String location = "com/tfnico/examples/guava/BaseTest.class";
		URL resource2 = this.getClass().getClassLoader().getResource(location);
		Preconditions.checkArgument(resource2!=null, "resource %s not found", location);
	}
	
	
	
}