Bài thực hành ngôn ngữ lập trình java

BÀI THỰC HÀNH NGÔN NGỮ LẬP TRÌNH JAVA private Scanner input; public void nhap { input = new ScannerSystem.in; System.out.println"Nhap cac he so:"; System.out.print"a = "; public static v

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 = ");

else {

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();

}

}

3 Tìm số trung gian của 3 số a,b,c:

Scanner input=new Scanner(System.in);

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

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

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 ");

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 ");

public static void main (String[] args) {

Bai5 temp= new Bai5();

temp.nhap();

temp.inra();

}

}

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.tinh() ; }

Scanner input =new Scanner(System.in);

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

public void tinh()

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);

}

public static void main(String[] str)

{

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();

dt.nhap();

dt.tinh();

}

}

5 Tính tổng và tích các chữ số của một số nguyên dương m cho trước:

Scanner input=new Scanner(System.in);

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

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");

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");

}

}

8 Kiểm tra số M có phải là số đối xứng không?

package baocao;

import java.util.Scanner;

public class Bai13 {

static int ;

private Scanner input;

public void nhap(){

input=new Scanner(System.in);

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

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();

dt.nhap();

dt.doixung(n);

}

}

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

package baocao;

import java.util.Scanner;

public class Bai14 {

int ;

private Scanner input;

public void nhap(){

input=new Scanner(System.in);

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

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;

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

}

public static void main(String[] args) {

Bai15 dt=new Bai15();

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

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

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

12 Kiểm tra số K có thuộc dãy Fibonaci hay không?

package baocao;

import java.util.Scanner;

public class Bai17 {

int ;

private Scanner input;

public void nhap()

{

input=new Scanner(System.in);

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

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= ");

a input.nextInt();

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

}

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.nhap();

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));

{

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");

cong.addActionListener(this);

tru.addActionListener(this);

nhan.addActionListener(this);

chia.addActionListener(this);

exit.addActionListener(this);

reset.addActionListener(this);

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));

public void actionPerformed(ActionEvent e)

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;

y=z;

}

if(z==n) return true; }

return false;

}

public void actionPerformed(ActionEvent e)

{

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");

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");

for(int i=0;i<=22;i++)

{jpn.add(jbnButtons[i]);

jbnButtons[i].addActionListener(this);

case 0: addDigitToDisplay(i);break;

case 1: addDigitToDisplay(i);break;

case 2: addDigitToDisplay(i);break;

case 3: addDigitToDisplay(i);break;

case 4: addDigitToDisplay(i);break;

case 5: addDigitToDisplay(i);break;

case 6: addDigitToDisplay(i);break;

case 7: addDigitToDisplay(i);break;

case 8: addDigitToDisplay(i);break;

case 9: addDigitToDisplay(i);break;

case 10: processSignChange();break;

case 11: addDecimalPoint();break;

case 12: processEquals();break;

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

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

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

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

case 17: if(displayMode!=ERROR_MODE)

}catch(Exception ex){

displayError("Khong hop le");

displayMode=ERROR_MODE; }

}catch(Exception ex){

displayError("Loi chia 0");

displayMode=ERROR_MODE; }

}catch(Exception ex){

displayError("Khong hop le");

displayMode=ERROR_MODE; }

}break;

case 20: if(displayMode!=ERROR_MODE){

setDisplayString(getDisplayString().substring(0, getDisplayString().length()-1));

if(getDisplayString().length()<1) setDisplayString("0");

}break;

case 21: clearExisting();break;

case 22: clearAll();break; }

} }

void addDigitToDisplay(int digit){

if(ClearOnNextDigit && !lastoperator.equals("0")) setDisplayString(""); String inputString=getDisplayString();

if(inputString.indexOf("0")==0 && inputString.indexOf(".")<0)

void addDecimalPoint(){

displayMode=INPUT_MODE;

//if(ClearOnNextDigit) setDisplayString("");

String inputString =getDisplayString();

if(inputString.indexOf(".")<0) setDisplayString(new

else setDisplayString("-"+input);

} }else if(displayMode==RESULT_MODE)

try{

double result=processLastOperator();

displayResult(result);

lastnumber=result;

}catch(Exception e){}

}else lastnumber=numberInDisplay;

}catch(Exception e){

displayError("Loi chia 0");

}lastoperator="0"; }

throw (new DivideByZeroException());

result = lastnumber / numberInDisplay;

displayMode = ERROR_MODE;

ClearOnNextDigit = true;

}

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)

{

gre=new Button("Green");

blu=new Button("Blue");

red=new Button("Red");

exit=new Button("Exit");

gre.addActionListener(this);

blu.addActionListener(this);

red.addActionListener(this);

exit.addActionListener(this);

this.setLayout(new FlowLayout(FlowLayout.CENTER));

}

public void actionPerformed(ActionEvent e)

{

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);

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");

ch1.add("Dog");

ch1.add("Cat");

ch1.add("chicken");

exit.addActionListener(this);

nam.addItemListener(this);

nu.addItemListener(this);

list1.addItemListener(this);

ch1.addItemListener(this);

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

gbs.fill=GridBagConstraints.BOTH;