Write code that allows to create only one instance of a class?

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import java.awt.*; import java.awt.event.*; public class Agency extends Frame implements ActionListener { Label l1,l2,l3,l4; Button b1; TextField t1,t2; String s1,s2,s3,s4; public static void main(String args[]) { new Agency().setVisible(true); } public Agency() { super("Gas Agency Package"); setSize(1280,800); setBackground(Color.lightGray); setLayout(null); // setLayout(new BorderLayout()); t1=new TextField(20); t1.setBounds(440,150,200,30); t1.setBackground(Color.white); t2=new TextField(20); t2.setBounds(440,180,200,30); t2.setBackground(Color.white); t2.setEchoChar('*'); l1=new Label("Gas Agency Package"); l1.setBounds(400,30,300,50); l1.setFont(new Font("TimesRoman",Font.BOLD,25)); l1.setAlignment(Label.CENTER); l2=new Label("Enter your ID and Passoword"); l2.setFont(new Font("TimesRoman",Font.BOLD,20)); l2.setBounds(270,80,300,50); l3=new Label("Enter ID"); l2.setFont(new Font ("TimesRoman",Font.BOLD,20)); l3.setBounds(270,150,120,50); l4=new Label("Enter Passoword"); l2.setFont(new Font ("TimesRoman",Font.BOLD,20)); l4.setBounds(270,180,140,50); add(l1); add(l2); add(l3); add(t1); add(l4); add(t2); b1=new Button("Login"); b1.setBackground(Color.white); b1.setBounds(400,280,100,70); b1.addActionListener(this); add(b1); } public void actionPerformed(ActionEvent e) { if(e.getSource()==b1) { s3="svce"; s4="svce"; s1=t1.getText(); s2=t2.getText(); if(s1.equals(s3) && s2.equals(s4)) { //System.out.println("password is correct"); MenuForm m= new MenuForm(); m.setVisible(true); //this.dispose(); } else { System.out.println("password not correct"); } this.dispose(); } } } plzzzzzzz xplain me this java code like why i m including this packages n the whole code plzzzzzz

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You have been asked to install a servlet engine (tomcat, glassfish, etc.) for a companies servlets. Assuming the company has an existing web/DBMS server (which may or may not be on the same server), explain in detail how would you implement the development project and a deployment solution.

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1.Explain what happens to a session object when the browser associated with it is closed? 2.Explain how a session object is created and used. (Note: you are not required to provide the Java statements such as ‘getAttribute’)

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can any one give me code to keyed a flat file and used chain in RPGLE to search any item

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I have a file which contains so many lines and variable number of lines are treated as a record. For example *first ooooo xxxxx ttttt mmmm vvvvvvv *end uuu bbbb *first kkkkvvvvvv nnnn mmmmm kkkkk fffff gggg ffff kkkk lllll *end. Here the lines from *first to *end are treated as a record. The number of lines between *first and *end is not same for all the records. Suppose there are 100 records (or number of records are not predefined)like the format given in the above example. Now the entire file needs to split into two files, first having 40 and remaining in the second file. Can we split using sort utility? If possible then what is the sort card?

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i want run following code on button click of view. i am trying to retrieve data from isc_order_details table and isc_product table. but after retriaval of data i m getting error like FIELD MUST BE ENTERED!! DECLARE m number; n number; CURSOR order_details IS SELECT PRODUCT_ORDER_QUAN,PRODUCT_ID FROM isc_order_details WHERE order_id=:isc_order_master.order_id; amount NUMBER (8,2):=0.0; alert number; BEGIN go_block('isc_order_details'); first_record; m:=:system.cursor_record; last_record; n:=:system.cursor_record; OPEN order_details; --for i in m..n loop FETCH order_details INTO :ISC_ORDER_DETAILS.PRODUCT_ORDER_QUAN,:ISC_ORDER_DETAIL S.PRODUCT_ID; IF order_details%FOUND THEN SELECT order_value,order_date INTO :ISC_ORDER_MASTER.ORDER_VALUE,:ISC_ORDER_MASTER.ORDER_D ATE FROM isc_order_master WHERE order_id=:ISC_ORDER_MASTER.ORDER_ID; SELECT product_desc,product_price INTO :ISC_ORDER_DETAILS.PRODUCT_DESC,:ISC_ORDER_DETAILS.PROD UCT_PRICE FROM isc_product WHERE product_id=:ISC_ORDER_DETAILS.PRODUCT_ID; next_record; END IF; EXIT WHEN order_details%NOTFOUND; END LOOP; last_record; CLOSE order_details; EXCEPTION when NO_DATA_FOUND then alert:=SHOW_ALERT('ENTER_DATA'); Go_Item('isc_order_master.order_id'); END;

0 Answers   Zensar,

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What is the coding about how to recognize color in fuzzy logic using Matlab R2009b?

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i have two internal tables with customer and credit amount in one table then customer and debit amount in another table. now i need output in single list as customer, credit amount, debit amount and (credit - debit). help me please

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Write a Program for matrix multiplication.

0 Answers   InterGraph,

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Design a timer circuit using VHDL which has the following: input : start_timer(ST) output: long_time(LT) short_time(ST) when the timer is triggered by the ST(either 0 or 1) signal the timer should generate two timing signals accordingly.While the long time is going ON the other should be OFF and vice versa.

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DAL in oracle

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