Output, Strings, Input
Output, Strings, Input
7 January 2019
OSU CSE
1
Simplest Java Program?
public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); }
}
7 January 2019
OSU CSE
2
Simplest Java Program?
public class HelloWorld {
public static void main(String[] args) {
System.opuutb.lpircinctllans(s"HdeeclllaroesWtohrisld!");
}
code to be a software component for which
}
bytecode should be
generated by the compiler;
HelloWorld is the name of
the class; details later.
7 January 2019
OSU CSE
3
Simplest Java Program?
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World!");
}
public static void is
}
required here when you want
a class to include a "main"
program that can be
executed by the JVM (and it
must be called main);
details later.
7 January 2019
OSU CSE
4
Simplest Java Program?
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World!");
}
String[] args means that
}
main expects the JVM to hand it
an array of Strings (called
command-line arguments)
when it is executed;
details later.
7 January 2019
OSU CSE
5
Simplest Java Program?
public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); }
} System.out is an object you may use to give output to the user; println is a method of that object that you may call (invoke) to output something on its own line; details later.
7 January 2019
OSU CSE
6
Simplest Java Program?
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
"Hello World!" is a
character string to be output
to the user;
details later.
7 January 2019
OSU CSE
7
Another Version (sans Comments)
import components.simplewriter.SimpleWriter; import components.simplewriter.SimpleWriter1L; public final class HelloWorld {
private HelloWorld() { } public static void main(String[] args) {
SimpleWriter out = new SimpleWriter1L(); out.println("Hello World!"); out.close(); } }
7 January 2019
OSU CSE
8
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