关于java的一道题

public class exam_6{
public static void main(String[] args) {
String str=_____("Welcome");
String temp=null;
if(args.length>0) {
____________;
}
if(________)
System.out.println("Equal");
else
System.out.println("Unequal");
System.out.println();
}
}
这个应该怎么添，为什么？？？请大家帮忙~

public class exam_6{
public static void main(String[] args) {
String str=new String("Welcome");
String temp=null;
if(args.length>0) {
temp=args[0];
}
if(str.equals(temp))
//if(str.==(temp))
System.out.println("Equal");
else
System.out.println("Unequal");
System.out.println();
}
}

public class exam_6{
public static void main(String[] args) {
String str=new String("Welcome");
String temp=null;
if(args.length>0) {
temp=args;
}
if(arge.equals(temp))
System.out.println("Equal");
else
System.out.println("Unequal");
System.out.println();
}
}

public class Play {

public static void main(String[] args) {

String str=new String("Welcome");
String temp=null;
if(args.length>0) {
____________;
}