import java.util.Scanner;
public class TestString{
public static void display() {
System.out.println("1. Khoi tao 1 xau rong");
System.out.println("2. Khoi tao 1 chuoi ky tu");
System.out.println("3. Cong 2 chuoi ky tu");
System.out.println("4. Noi 2 chuoi bang phuong thuc conCat");
System.out.println("5. Su dung ham substring de lay 1 chuoi ky tu trong 1 xau");
System.out.println("6. Su dung ham Length, Lay ra do dai cua chuoi");
System.out.println("7. Ham equals");
System.out.println("8. toUpperCase");
System.out.println("9. toLowerCase");
System.out.println("10. Exit");
}
public void xauRong(){
System.out.println("Khoi tao 1 xau rong");
String str1 = new String();
System.out.println("Xau rong! ko co ky tu nao: "+str1);
}
public void xau_ko_rong(){
System.out.println("\n");
Scanner s = new Scanner(System.in);
String str2 = "";
System.out.println("Nhap vao 1 chuoi ky tu: ");
str2 = s.nextLine();
System.out.println("Chuoi ma ban vua nhap la: "+str2);
}
public void congChuoi(){
System.out.println("\n");
System.out.println("Cong 2 chuoi:");
String str3 =new String("chao cac ban!");
System.out.println("thanks va "+str3);
}
public void conCat(){
System.out.println("\n");
Scanner s1 = new Scanner(System.in);
System.out.println("Noi 2 chuoi bang phuong thuc concat :");
String t1="";
System.out.println("Nhap vao 1 chuoi ky tu thu 1: ");
String t3;
t1 = s1.nextLine();
String t2="";
System.out.println("Nhap vao 1 chuoi ky tu thu 2: ");
t2 = s1.nextLine();
System.out.println("Chuoi ky tu thu 1 vua nhap: "+t1);
System.out.println("Chuoi ky tu thu 2 vua nhap: "+t2);
t3=t1.concat(t2);
System.out.println("\n");
System.out.println("Chuoi ky tu sau khi ghep la:"+t3);
}
public void substring(){
System.out.println("\n");
System.out.println("Su dung ham substring de lay 1 chuoi ky tu trong 1 xau:");
Scanner s2 = new Scanner(System.in);
String str4 = "";
System.out.println("Nhap vao 1 chuoi ky tu: ");
str4 = s2.nextLine();
System.out.println("Chuoi ma ban vua nhap la: "+str4);
String str5=str4.substring(4,12);
System.out.println("\n");
System.out.println("Chuoi ky tu lay trong xau: "+str5);
}
public void length(){
System.out.println("\n");
System.out.println("Lay ra do dai cua chuoi:");
Scanner s3 = new Scanner(System.in);
String str6 = "";
System.out.println("Nhap vao 1 chuoi ky tu: ");
str6 = s3.nextLine();
System.out.println("Chuoi ma ban vua nhap la: "+str6);
int n=str6.length();
System.out.println("Do dai la:"+n);
}
public void equals(){
System.out.println("\n");
Scanner s4 = new Scanner(System.in);
String str7 = "";
String str8 = "";
System.out.println("Nhap vao chuoi thu nhat:");
str7 = s4.nextLine();
System.out.println("Nhap vao chuoi thu hai:");
str8 = s4.nextLine();
System.out.println("chuoi thu nhat ban nhap:"+str7);
System.out.println("chuoi thu hai ban nhap:"+str8);
System.out.println("\n");
Boolean k=str7.equals(str8);
System.out.println("2 chuoi co giong nhau ko? "+k);
System.out.println("\n");
}
public void toUpperCase(){
Scanner s5 = new Scanner(System.in);
String str9 = "";
System.out.println("Nhap vao 1 chuoi ky tu: ");
str9 = s5.nextLine();
System.out.println("Chuoi ma ban vua nhap la: "+str9);
String str10 = str9.toUpperCase();
System.out.println("Chuyen chuoi sang dang ky tu in Hoa: "+str10);
}
public void toLowerCase(){
Scanner s6 = new Scanner(System.in);
String str11 = "";
System.out.println("Nhap vao 1 chuoi ky tu in Hoa: ");
str11 = s6.nextLine();
System.out.println("Chuoi ma ban vua nhap la: "+str11);
String str12 = str11.toLowerCase();
System.out.println("Chuyen chuoi sang dang ky tu thuong: "+str12);
}
public static void main(String[] args){
TestString xau_1 = new TestString();
Scanner s = new Scanner(System.in);
int i = 0;
while (i != 10) {
display();
System.out.println("\n");
System.out.println("\n");
System.out.print("moi ban chon so: ");
i = s.nextInt();
if(i == 1){
System.out.println("\n");
System.out.println("ban da chon: Phuong an 1");
xau_1.xauRong();
System.out.println("\n");
}
else if(i == 2) {
System.out.println("\n");
System.out.println("ban da chon: Phuong an 2");
xau_1.xau_ko_rong();
System.out.println("\n");
}
else if(i == 3) {
System.out.println("\n");
System.out.println("ban da chon: Phuong an 3");
xau_1.congChuoi();
System.out.println("\n");
}
else if(i == 4) {
System.out.println("\n");
System.out.println("\n");
System.out.println("Xau sau khi ghep: ");
xau_1.conCat();
System.out.println("\n");
}
else if(i == 5) {
System.out.println("\n");
System.out.println("ban da chon: Phuong an 5");
xau_1.substring();
System.out.println("\n");
}
else if(i == 6) {
System.out.println("\n");
System.out.println("ban da chon: Phuong an 6");
xau_1.length();
System.out.println("\n");
}
else if(i == 7) {
System.out.println("\n");
System.out.println("ban da chon: Phuong an 7");
xau_1.equals();
System.out.println("\n");
}
else if(i == 8) {
System.out.println("\n");
System.out.println("ban da chon: Phuong an 8");
xau_1.toUpperCase();
System.out.println("\n");
}
else if(i == 9) {
System.out.println("\n");
System.out.println("ban da chon: Phuong an 9");
xau_1.toLowerCase();
System.out.println("\n");
}
}
}
/* TestString xau_1 = new TestString();
xau_1.xauRong();
xau_1.xau_ko_rong();
xau_1.congChuoi();
xau_1.conCat();
xau_1.substring();
xau_1.length();
xau_1.equals();
} */
}
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