for - 迴圈超難java題目...求寫程式

[q738...@yahoo.com.tw]

-----------------------------------第一
題-----------------------------------
import java.util.*;

public class example {

public static void main(String[] args) {
String password = "";
String keyin = "";
Scanner in = new Scanner(System.in);
System.out.println("請輸入你所想要設定的密碼");
password = in.next();
for (int i=0; i<3; i++) {
System.out.println("請輸入你所設定的密碼");
keyin = in.next();
if (keyin.equals(password))
System.out.println("密碼正確");
else {
System.out.println("密碼錯誤");
break;
}
if (i == 2) {
System.out.println("密碼錯誤次數已達三次，程式結束");

}
}
}
}
-----------------------------------第二
題-----------------------------------
import java.util.*;

public class example {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);
String[] keyin = {","};
String bingonumber = "1,2,3,4,5,6";
String[] bna = bingonumber.split(",");

System.out.println("請輸入6個1~49的號碼並用「,」作為分隔");
keyin = in.next().split(",");

Arrays.sort(keyin);
Arrays.sort(bna);

int bn = 0;
for (int i=0; i<6; i++) {
for (int j=0; j<6; j++) {
if (keyin[i].equals(bna[j])) {
bn++;
break;
}
}
}
if (bn == 6)
System.out.println("恭喜你中頭獎");
else
System.out.println("你中了"+bn+"個號碼");
}
}
-----------------------------------第三
題-----------------------------------
import java.util.*;

public class example {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);
System.out.println("請輸入你的身高");
int keyin = in.nextInt();
if (keyin < 120)
System.out.println("120公分以下免費");
else if (keyin > 119 && keyin < 150)
System.out.println("120~150公分半價");
else if (keyin > 149)
System.out.println("150公分以上全票");
}
}
-----------------------------------第四
題-----------------------------------
import java.util.*;

public class example {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);
System.out.println("請輸入繩索長度");
int rope = in.nextInt();
int count = 0;
while (rope > 19) {
rope -= 20;
count++;
}
System.out.println("共要對折"+count+"次才會小於20公分");
}
}