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Java Programming
The Java programming language was released in 1995 as a core component of the Java platform of Sun Microsystems. It is a general-purpose, class-based, object-oriented language that is widely used in application software and web applications.
5,203 Questions
The array has eight elements indexed 0 to 7. The middle element will be found at index (0+7)/2=3. Element 3 has the value 26, which is smaller than 88, so 88 must reside in the array starting at index 4 ending at index 7.
The array has four elements indexed 4 to 7. The middle element can be found at index (4+7)/2=5. Element 5 has the value 56, which is smaller than 88, so 88 must reside in the array starting at index 6 ending at index 7.
The array has two elements indexed 6 to 7. The middle element can be found at index (6+7)/2=6. Element 6 has the value 88. Thus 88 was found at index 6.
Obfuscating
public void getPoint(double r, double angle)
{
//cosine*hypotenuse=adjasent
double x = r * Math.cos (Math.toRadians(angle))//in radians;
//sine * hypotenuse =opposite
double y=r*Math.sin(Math.toRadians(angle))//also in radians;
System.out.println("( "+x+", "+y+" )");
}
How is interface instantiated in anonymous class for example new ActionListener?
They key word here is anonymous class. While ActionListener may be an interface, the anonymous class would be a subclass of ActionListener. It would be like creating a new class which implements ActionListener.
JButton button = new JButton("Press Me!");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
System.out.println("PRESS");
}
});
If you don't type a constructor into your class code, a default constructor will be automatically generated by the compiler. The default constructor is ALWAYS a no-arg constructor. (Obviously the compiler has no clue what all arguments you might want for your class. So it takes the safe way out with a no argument constructor)
A no-arg constructor is not necessarily the default (i.e., compiler-supplied) constructor, although the default constructor is always a no-arg constructor. The default constructor is the one the compiler provides! While the default constructor is always a no-arg constructor, you're free to put in your own no-arg constructor.
What is an unclosed string literal?
The error "unclosed string literal" means that you wrote a double quote " somewhere but you didn't write another double quote later on to close the string.
Note: You cannot start writing a string on one line and continue on another line, like this:
System.out.println("Hello
World");
If you absolutely want to distribute this over multiple lines, do it like this:
System.out.println("Hello "
+ "World");
How to write Java program for find longest word in a string?
class LongestWord
{
String str = "Ram is intelligent boy";
String stringArray[] = str.split("\\s");
public String compare(String st1, String st2){
if(st1.length()>st2.length()){
return st1;
}
else{
return st2;
}
}
LongestWord(){
String word = "";
for(int i=0;i if(i==0){ word = stringArray[0]; } word = compare(word, stringArray[i]); } System.out.println("Longest word = " + word); } public static void main(String []args){ new LongestWord(); } }
What is an example program in Bluej whether a number is a palindrome or not?
class test
{
public static void main(int num)
{ int num2=num;
int rnum=0;
while (num2>0)
{ int q=num2/10;
int dig=num2%10;
rnum = rnum*10+dig;
num2=q;
}
if (rnum==num)
System.out.println("Palindrome number");
else
System.out.println("Not a Palindrome number");
}
}
If else else sample programs java?
if (i==2)
if (j==2) System.out.println ("i==2 and j==2");
else System.out.println ("i==2 and j<>2");
else System.out.println ("i<>2");
When an object in created within another object, the relationship between them is containment.
Why the index of an array be a positive number?
Since an array cannot contain a negative number of items, the size of an array must be at least 0. So if you ever tried to retrieve the element at a negative index in an array, it would automatically be understood to be out-of-bounds.
What is the process of writing the state of an object to a byte stream called?
This is called serialization.
Conditional statement inside a conditional loop?
int i = 100;
while(i > 0) { // Conditional loop
--i;
if((i % 2) == 0) { // Conditional statement inside a conditional loop
System.out.println(i + " is even.");
}
}
This is a homework assignment. write your homework assignments for you because you have been given them so that you learn the skills you will need in life.
However, if while doing this assignment you have specific things you need help to understand WikiAnswers will be happy to answer these specific questions for you.
Simple non-array variables are usually passed to methods by?
Simple non-array variables are usually passed to methods by value.
How do you make struts action class thread safe?
1.Only Use Local Variables
§The most important principle that aids in thread-safe coding is to use only local variables, not instance variables , in your Action class. Local variables are created on a stack that is assigned (by your JVM) to each request thread, so there is no need to worry about sharing them. An Action can be factored into several local methods, so long as all variables needed are passed as method parameters. This assures thread safety, as the JVM handles such variables internally using the call stack which is associated with a single Thread.
2.Conserve Resources
As a general rule, allocating scarce resources and keeping them across requests from the same user (in the user's session) can cause scalability problems. For example, if your application uses JDBC and you allocate a separate JDBC connection for every user, you are probably going to run in some scalability issues when your site suddenly shows up on Slashdot. You should strive to use pools and release resources (such as database connections) prior to forwarding
public class Point {
public int x;
public int y;
}
