public interface IWriter {
void write();
}
public static void main(String[] args) {
IWriter writer = new IWriter() {
@Override
public void write() {
System.out.println("IWriter write...");
}
};
writer.write();
}

public abstract class AbstractWriter {
public abstract void write();
}
public static void main(String[] args) {
AbstractWriter abstractWriter = new AbstractWriter() {
@Override
public void write() {
System.out.println("AbstractWriter write...");
}
};
abstractWriter.write();
} 

public class TextWriter implements IWriter {
@Override
public void write() {
System.out.print("text writer..");
}
}
public static void main(String[] args) {
TextWriter textWriter = new TextWriter() {
@Override
public void write() {
System.out.println("TextWriter 2 write...");
}
};
textWriter.write();
} 

public static void main(String[] args) {
Thread thread = new Thread() {
@Override
public void run() {
new IWriter() {
@Override
public void write() {
System.out.println("IWriter thread write...");
}
}.write();
}
};
thread.run();
}