SOME COMPUTER STUFF ON C,JAVA,TALLY,BCA,SOLVED PAPERS

package work; import java.io.*; public class pack1 { public static String make(int n) { String s=""; int i,j,k; for(i=0; i<n;i++) { for(k=n-i-1;k>=0;k--) s=s+" "; for(j=0;j<=i*2+1;j++) s=s+"*"; s+="\n"; } return s; } } import java.applet.*; import javax.swing.*; import javax.swing.event.*; import java.awt.event.*; import java.awt.*; import java.io.*; import java.lang.*; import work.pack1; public class a2 implements ActionListener { JButton b1,b2; JFrame jf; JTextArea jta; JScrollPane  jsp; JTextField jtf; JToolBar jtb; a2() { frame(); button(); text(); jf.setVisible(true); tool(); } public void button() { b1=new JButton("pattern"); b2=new JButton("clear"); b1.addActionListener(this); b2.addActionListener(this); } public void tool() { jtb=new JToolBar(); jtb.add(b1); jtb.add(b2); jtb.add(jtf); jf.add(jtb,BorderLayout.NORTH); } public void frame(