BÀI THỰC HÀNH NGÔN NGỮ LẬP TRÌNH JAVA

BÀI THỰC HÀNH NGÔN NGỮ LẬP TRÌNH JAVA

BÀI THỰC HÀNH NGÔN NGỮ LẬP TRÌNH JAVA

private Scanner input;

public void nhap() {

input = new Scanner(System.in);

System.out.println("Nhap cac he so:");

System.out.print("a = ");

public static void main(String arg[]) {

Bai1 dt = new Bai1();

dt.nhap();

dt.giai();

}

}

public void nhap() {

Scanner input = new Scanner(System.in);

System.out.println("Nhap cac he so");

System.out.print("a = ");

System.out.println("PT co 2 nghiem phan biet");

System.out.println("x1 = " + ((-b-Math.sqrt(delta))/(2*a)));System.out.println("x2 = " + ((-b+Math.sqrt(delta))/(2*a)));}

}

}

public static void main(String areg[]) {

Bai2 dt = new Bai2();

dt.nhap();

dt.giai();

Scanner input=new Scanner(System.in);

System.out.println("Nhap a b c:");

System.out.print("a= ");

if(((a<=b)&&(b<=c))||((c<=b)&&(b<=a))) tg=b

else if(((b<=a)&&(a<=c))||((c<=a)&&(a<=b))) tg=a

else tg=c

System.out.println(" So trung gian la "+tg);

}

public static void main (String[] args) {

Bai3 stg=new Bai3();

stg.nhap();

stg.tg();

}

}

4 Viết chương trình tính tiền cho bài toán karaoke:

Scanner input =new Scanner(System.in);

System.out.println("Nhap gio bat dau ");

if( > 0 && b<=18) sotien = (b a)*45000;

if( >0 && b>18) sotien = (18-a)*45000 + (b-18)*60000;

5 Nhập vào tháng năm bất kì in ra số ngày ứng với tháng năm đó:

package baocao;

import java.util.Scanner;

public class Bai5 {

int nam,thang;

public Bai5() {

}

public boolean namnhuan(int nam)

{

if((nam%4==0 && nam%100!=0)||(nam%400==0)) return true;

else return false;

}

public void nhap()

{

Scanner input= new Scanner (System.in);

System.out.println("Nhap nam thang ");

System.out.print("Nam ");

case 2 : if(namnhuan(nam))

{System.out.println("Thang "+thang+" nam"+nam+" co 29

public static void main (String[] args) {

Bai5 temp= new Bai5();

Scanner input=new Scanner(System.in);

System.out.println("Nhap n");

for(int i=1;i<=n;i++) s+=(float) 1/i;

System.out.println("S= "+s);

}

public static void main (String[] args) {

Bai6 b6=new Bai6();

b6.nhapn();

b6.tinh() ;}

}

Scanner input =new Scanner(System.in);

System.out.print("Nhap n = ");

Scanner input =new Scanner(System.in);

System.out.println("Nhap n : ");

for(int i=1;i<2*n;i+=2) s+=1.0f/giaithua(i);

System.out.print("S = " + s);

Scanner input=new Scanner(System.in);

System.out.print("Nhap n= ");

public static void main(String[] args) {

// TODO Auto-generated method stub

Bai9 dt=new Bai9();

Scanner input=new Scanner(System.in);

System.out.print("Nhap so nguyen duong m= ");

tam=tam/10;

}

System.out.println("Tong cac chu so cua "+ +" la "+s);

System.out.println("Tich cac chu so cua "+ +" la "+p);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Bai10 dt=new Bai10();

public void nhap() {

Scanner input = new Scanner(System.in);

System.out.print("Nhap so : ");

public static void main(String args[]) {

Bai11 a = new Bai11();

a.nhap();

if (a.check()) System.out.println(n + " la so nguyen to");

else System.out.println(a.get() + " ko phai la so nguyen to");}

}

7 Kiểm tra số P có phải là số chính phương không?

input=new Scanner(System.in);

System.out.printf("Nhap n= ");

n input.nextInt();

}

public boolean chinhphuong(){

for(int i=0;i<=n;i++) if(i*i==n) return true;

if(dt.chinhphuong()) System.out.println(n+ " la so chinh phuong");

else System.out.println(n+ " khong la so chinh phuong");

private Scanner input;

public void nhap(){

input=new Scanner(System.in);

System.out.print("Nhap n=");

n input.nextInt();

if(dao==n) System.out.println(n+ " la so doi xung");

else System.out.println(n+" Khong phai la so doi xung");

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Bai13 dt=new Bai13();

private Scanner input;

public void nhap(){

input=new Scanner(System.in);

System.out.print("Nhap n=");

n input.nextInt();

}

public boolean nto(int n)

{

if(n==0||n==1) return false;

else for(int i=2;i<n;i++) if(n%i==0) return false;

return true;

}

public void in(){

System.out.println("Cac so nguyen to <= " +n+ " la : ");

for(int i=2;i<=n;i++) if(nto(i)) System.out.print(" "+i);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Bai14 dt=new Bai14();

public class Bai15 {

public boolean hh(int n)

{

int sum=0;

for (int i=1;i<n;i++) if(n%i==0) sum+=i;

if (sum==n) return true;

return false;

}

public void inra()

{

System.out.println ("Cac so hoan hao <1000 la: ");

for(int i=1;i<1000;i++) if(hh(i)) System.out.println(i);

}

public static void main(String[] args) {

Bai15 dt=new Bai15();

dt.inra();

}

}

11 In ra n chữ số Fibonaci đầu tiên:

System.out.println(n " Chu so Fibonaci dau tien la: ");

for(int i=1;i<=n;i++)

System.out.print(fibo(i)+" ");

private Scanner input;

public void nhap()

{

input=new Scanner(System.in);

System.out.print("Nhap n= ");

x=y;

y=z;

}

if(z==n) System.out.println(n+ " la so FIBONACI");

else System.out.println(n " Khong phai la so FBONACI");

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Bai17 dt=new Bai17();

private Scanner input;

public void nhap()

{

input=new Scanner(System.in);

System.out.println("Nhap 2 so: ");

System.out.print("a= ");

}

System.out.println("UCLN cua "+ +" va "+ +" la: "+uc);

System.out.println("BCNN cua "+ +" va "+ +" la: "+(a b)/uc);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Bai18 dt=new Bai18();

dt.ucbc();

}

}

CHƯƠNG II: LẬP TRÌNH AWT-SWING

public void GUI() {

lb=new Label("Giai phuong trinh bac nhat");

lb1=new Label("Nhap a");

lb2=new Label("Nhap b");

lb3=new Label("Ket qua");

txta=new TextField();

txtb=new TextField();

txtkq=new TextField();

kq=new Button("Tinh");

reset=new Button("Reset");

thoat=new Button("Thoat");

kq.addActionListener(this);

reset.addActionListener(this);

thoat.addActionListener(this);

pn=new Panel(new GridLayout(3,1));

pn1=new Panel(new GridLayout(1,1));

pn2=new Panel(new GridLayout(3,2));

pn3=new Panel(new GridLayout(1,3));

if(e.getSource()==kq)

{

int a=Integer.parseInt(txta.getText());

int b=Integer.parseInt(txtb.getText());

if(a!=0) txtkq.setText(Float.toString((float)-b/a) );

else if(b==0) txtkq.setText("Pt vo so nghiem");

else txtkq.setText("Pt vo nghiem");

public static void main (String[] args) {

new Bai19("Giai pt bac 1");

}

}

2 Minh họa các phép toán:

lb=new Label("Minh hoa cac phep toan");

lb1=new Label("Nhap a");

lb2=new Label("Nhap b");

lb3=new Label("Ket qua");

txta=new TextField("");

txtb=new TextField("");

txtkq=new TextField("");

cong=new Button("Cong");

tru=new Button("Tru");

nhan=new Button("Nhan");

chia=new Button("Chia");

exit=new Button("Exit");

reset=new Button("Reset");

pn=new Panel(new GridLayout(4,1));

pn1=new Panel(new GridLayout(1,1));

pn2=new Panel(new GridLayout(3,2));

pn3=new Panel(new FlowLayout(FlowLayout.CENTER));

pn4=new Panel(new FlowLayout(FlowLayout.CENTER));

double a=Double.parseDouble(txta.getText());

double b=Double.parseDouble(txtb.getText());

if (e.getSource()==cong) txtkq.setText(Double.toString(a+b));

if (e.getSource()==tru) txtkq.setText(Double.toString(a-b));

if (e.getSource()==nhan) txtkq.setText(Double.toString(a*b));

if (e.getSource()==chia) txtkq.setText(Double.toString(a/b));

public static void main (String[] args) {

new Bai20("Minh hoa cac phep toan");

}

}

3 In ra các số nguyên tố nhỏ hơn hoặc bằng số n cho trước:

//String chuoi1=new String();

//String chuoi2=new String(" ");

Label lb,lb1,lb2;

TextField txtnhap,txtkq;

Button tim,reset,exit;

Panel pn,pn1,pn2,pn3;

public void GUI1(){

lb=new Label("Cac so nguyen to <=n ");

lb1=new Label("Nhap n:");

lb2=new Label("KQ:");

txtnhap=new TextField();

txtkq=new TextField();

txtkq.setEditable(false);

tim=new Button("Tim");

exit=new Button("Exit");

reset=new Button("Reset");

tim.addActionListener(this);

exit.addActionListener(this);

reset.addActionListener(this);

pn=new Panel(new GridLayout(3,1));

pn1=new Panel(new GridLayout(1,1));

pn2=new Panel(new GridLayout(2,2));

pn3=new Panel(new FlowLayout(FlowLayout.CENTER));

if(t==0||t==1) return false;

else for(int i=2;i<=(t/2);i++) if((t%i)==0) return false ;

public static void main (String[] args) {

new Bai21("Tim so nguyen to");

}

}

4 Kiểm tra một số có thuộc dãy Fibonaci hay không?

Button ok,reset,exit;

Panel pn=new Panel();

GridBagLayout gb=new GridBagLayout();

GridBagConstraints gbs=new GridBagConstraints();

public Bai22(String st)

{

super(st);

lb=new Label("Kiem tra a co thuoc day Fibonaci");

lb1=new Label("Nhap a:");

lb2=new Label("KQ: ");

txtnhap=new TextField(20);

txtkq=new TextField(20);

ok=new Button("OK");

reset=new Button("Reset");

exit=new Button("Exit");

ok.addActionListener(this);

reset.addActionListener(this);

exit.addActionListener(this);

//pn=new Panel(new GridBagLayout());

gbs.insets=new Insets(2, 2, 2, 2);

gbs.fill=GridBagConstraints.BOTH;

if(e.getSource()==exit) System.exit(0);

else if(e.getSource()==reset) {

txtnhap.setText("");

txtkq.setText("");

}

else {

int a=Integer.parseInt(txtnhap.getText());

if(fibo(a)) txtkq.setText(a+" la so FIBONACI");

else txtkq.setText(a+" khong la so FIBONACI");

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new Bai22("Kiem tra fibo");

}

}

5 Mô tả máy tính điện tử cá nhân

package baocao;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Bai23 extends JFrame implements ActionListener{

GridBagLayout gb=new GridBagLayout();

GridBagConstraints gbc=new GridBagConstraints();

final int MAX_INPUT_LENGTH=20;

final int INPUT_MODE=0;

final int RESULT_MODE=1;

final int ERROR_MODE=2;

int displayMode=INPUT_MODE;

boolean ClearOnNextDigit,percent;

double lastnumber=0;

String lastoperator="0";

private JTextField txtkq=new JTextField("0",20);

private JButton jbnButtons[];

JPanel jpn=new JPanel();

public Bai23(String s)

{

super(s);

jbnButtons=new JButton[23];

gbc.insets=new Insets(3, 3, 3, 3);

gbc.fill=GridBagConstraints.BOTH;

for(int i=0;i<=9;i++) jbnButtons[i]= new

JButton(String.valueOf(i));

jbnButtons[10]=new JButton("+/-");

jbnButtons[11]=new JButton(".");

jbnButtons[12]=new JButton("=");

jbnButtons[13]=new JButton("/");

jbnButtons[14]=new JButton("*");

jbnButtons[15]=new JButton("-");

jbnButtons[16]=new JButton("+");

jbnButtons[17]=new JButton("sqrt");

jbnButtons[18]=new JButton("1/x");

jbnButtons[19]=new JButton("%");

jbnButtons[20]=new JButton("Backspace");

jbnButtons[21]=new JButton("CE");

jbnButtons[22]=new JButton("C");

case 13: processOperator("/");break;

case 14: processOperator("*");break;

case 15: processOperator("-");break;

case 16: processOperator("+");break;

case 17: if(displayMode!=ERROR_MODE)

case 18: if(displayMode!=ERROR_MODE){

}break;

case 20: if(displayMode!=ERROR_MODE){

setDisplayString(getDisplayString().substring(0,

void addDigitToDisplay(int digit){

if(ClearOnNextDigit && !lastoperator.equals("0"))

else setDisplayString("-"+input);

}}else if(displayMode==RESULT_MODE)

void processOperator(String op){

if(displayMode!=ERROR_MODE)

if (numberInDisplay == 0)

throw (new DivideByZeroException());

result = lastnumber / numberInDisplay;

public static void main(String[] args) {

// TODO Auto-generated method stub

new Bai23("Calculator");

//Bai23 dt=new Bai23("Calculator");

public class Bai24 extends Frame implements ActionListener {

Button gre,blu,red,exit;

public Bai24(String st)

{

super(st);

gre=new Button("Green");

blu=new Button("Blue");

red=new Button("Red");

exit=new Button("Exit");

if (e.getSource()==exit) System.exit(0);

if(e.getSource()==gre) this.setBackground(Color.GREEN);

if(e.getSource()==blu) this.setBackground(Color.BLUE);

if(e.getSource()==red) this.setBackground(Color.RED);

public class Bai25 extends Frame implements ActionListener,ItemListener {

Label lb=new Label("The item is display here");

CheckboxGroup cg=new CheckboxGroup();

Checkbox nam=new Checkbox("Male", cg, true);

Checkbox nu=new Checkbox("Female", cg, false);

List list1 =new List(3,false);

Choice ch1=new Choice();

Button exit=new Button("Exit");

Panel pn=new Panel();

GridBagLayout gb=new GridBagLayout();

GridBagConstraints gbs=new GridBagConstraints();

public Bai25(String st)

{

super(st);

list1.add("MSDOS");

list1.add("WINDOW");

list1.add("LINUX");

list1.add("UNIX");

gbs.insets=new Insets(8, 2, 8, 2);

gbs.fill=GridBagConstraints.BOTH;

public void actionPerformed(ActionEvent e)

if(e.getSource()==exit) System.exit(0);

public static void main(String[] args) {

// TODO Auto-generated method stub

new Bai25("Tong hop cac item");

Label lTitle,lInputA,lInputB,lKq;

TextField tInputA,tInputB,tKq;

Button Tinh,Reset,Thoat;

public void init(){

lTitle = new Label("Giai phuong trinh bac nhat");

lInputA = new Label("Nhap a");

lInputB = new Label("Nhap b");

lKq = new Label("Ket qua");

tKq = new TextField();

tInputA = new TextField();

tInputB = new TextField();

Tinh = new Button("Tinh");

Reset = new Button("Reset");

Thoat = new Button("Thoat");

p2.add(lInputA); p2.add(tInputA);

p2.add(lInputB); p2.add(tInputB);

public void actionPerformed(ActionEvent ae){

if(ae.getSource()==Thoat) System.exit(1);

if(ae.getSource()==Tinh){

double a,b;

a=Double.parseDouble(tInputA.getText());

b=Double.parseDouble(tInputB.getText());

if(a==0)

if(b==0) tKq.setText("pt co vo so nghiem");

else tKq.setText("Pt vo nghiem");

2 Minh họa các phép toán:

lb=new Label("Minh hoa cac phep toan");

lb1=new Label("Nhap a");

lb2=new Label("Nhap b");

lb3=new Label("Ket qua");

txta=new TextField("");

txtb=new TextField("");

txtkq=new TextField("");

cong=new Button("Cong");

tru=new Button("Tru");

nhan=new Button("Nhan");

chia=new Button("Chia");

exit=new Button("Exit");

reset=new Button("Reset");