Difference between revisions of "Java10/Examples"

package packvar;
 
import java.util.ArrayList;
import java.util.List;
 
public class VarUsage {
	public static void main(String[] args) {
		String s = new String("Hello World");
 
		var x = s; // var allowed in the variable declaration
		System.out.println(x);
 
		List<String> l = new ArrayList<>();
		l.add("List.Hello");
		for (var lx : l) { // var allowed in enhanced for loop
			System.out.println(lx);
		}
	}
}

package packvar;
 
public class VarError {
  public static void main(String[] args) {
    String s = new String("Hello");
    var x; // compiler error: Cannot use 'var' on variable without  initializer	
    var y = null; // compiler error: Cannot infer type for local variable initialized to 'null'	
  }
}

package packvar;
 
public class VarComplete {
  public static void main(String[] args) {
	String s = new String("hello");
 
	va // try completing here
}
}

package packvar;
 
public class VarComplete {
	va // complete here - 'var' not offered as a completion candidate
}

package packvar;
public class VarComplete {	
  public static void main(String[] args) {
	String s = new String("hello");
	var x = s;
	System.out.println(x);
  }
}

package packvar;
public class VarComplete {	
  public static void main(String[] args) {
	String s = new String("hello");
	var x = s;
	System.out.println(x);
  }
}

package packvar;
public class VarComplete {	
  public static void main(String[] args) {
	String s = new String("hello");
	String x = s;
	System.out.println(x);
  }
}