我刚刚学JAVA,我试着编了一点儿,有点乱,希望大家能不吝赐教,共同进步!
class Huiwenshu {
public static void main(String[] args) {
int low = 1, heigh = 300; //设定开始值low,结束值heigh
int i = 0; //初始变量,存储用户输入的整数
if (args.length == 0) { //判断用户是否输入参数,不带参数时执行区段low-height,查找回文数
int count = 0;
System.out.println(
"判断某个整数是否是回文数:\n\t运行参数:\n\tjava Huiwenshu [int]\n\teg: java Huiwenshu 123\n");
System.out.println("下面是从" + low + "到" + heigh + "的回文数:\n");
for (i = low; i < heigh + 1; i++) {
if (huiwen(i, weiShu(i))) {
System.out.print(i + " ");
count++;
if (count % 10 == 0) { //输出回文数,每10个一行
System.out.println();
}
}
}
}
else { //输入一个整数作为参数,则判断这个整数是否是回文数
i = Integer.parseInt(args[0]);
if (huiwen(i, weiShu(i))) {
System.out.print(i + "是回文数");
}
else {
System.out.println(i + "不是回文数");
}
}
} public static int weiShu(int m) { //计算整数的位数
int weishutemp = m;
int weishu1 = 1;
for (; weishutemp / 10 > 0; ) {
weishutemp = weishutemp / 10;
weishu1++;
}
return weishu1;
} public static boolean huiwen(int j, int k) { //判断整数是否是回文数
int n = j;
StringBuffer strbuf1 = new StringBuffer();
String str1 = "", str2 = "";
for (int l = 0; l < k; l++, n /= 10) {
strbuf1.append(String.valueOf(n % 10));
}
str1 = strbuf1.toString();
str2 = strbuf1.reverse().toString();
if (str1.equals(str2)) {
return true;
}
else {
return false;
}
}
}
class Huiwenshu {
public static void main(String[] args) {
int low = 1, heigh = 300; //设定开始值low,结束值heigh
int i = 0; //初始变量,存储用户输入的整数
if (args.length == 0) { //判断用户是否输入参数,不带参数时执行区段low-height,查找回文数
int count = 0;
System.out.println(
"判断某个整数是否是回文数:\n\t运行参数:\n\tjava Huiwenshu [int]\n\teg: java Huiwenshu 123\n");
System.out.println("下面是从" + low + "到" + heigh + "的回文数:\n");
for (i = low; i < heigh + 1; i++) {
if (huiwen(i, weiShu(i))) {
System.out.print(i + " ");
count++;
if (count % 10 == 0) { //输出回文数,每10个一行
System.out.println();
}
}
}
}
else { //输入一个整数作为参数,则判断这个整数是否是回文数
i = Integer.parseInt(args[0]);
if (huiwen(i, weiShu(i))) {
System.out.print(i + "是回文数");
}
else {
System.out.println(i + "不是回文数");
}
}
} public static int weiShu(int m) { //计算整数的位数
int weishutemp = m;
int weishu1 = 1;
for (; weishutemp / 10 > 0; ) {
weishutemp = weishutemp / 10;
weishu1++;
}
return weishu1;
} public static boolean huiwen(int j, int k) { //判断整数是否是回文数
int n = j;
StringBuffer strbuf1 = new StringBuffer();
String str1 = "", str2 = "";
for (int l = 0; l < k; l++, n /= 10) {
strbuf1.append(String.valueOf(n % 10));
}
str1 = strbuf1.toString();
str2 = strbuf1.reverse().toString();
if (str1.equals(str2)) {
return true;
}
else {
return false;
}
}
}
public static void main(String[] arg){
int count=0;
for(int i=1;i<3000;i++){
String s=i+"";
StringBuffer sb=new StringBuffer(s);
if(sb.reverse().toString().equals(s))
{
count++;
System.out.println(s);
}
}
}
}////////////////////////
看看何不合适