转换字符串: public class hello7 { public static void main(String[]args){ String s=".ymene tsrow sih si nam yrevE"; char[]arr=s.toCharArray(); StringBuilder sb=new StringBuilder(); for(int i=arr.length-1;i>=0;i--){ sb.append(arr[i]); } System.out.println("元字符串:"+s); System.out.println("转换后串:"+sb); } }
//StringBufferOp.java //反转字符串中的字符 public class StringBufferOp { public static void main(String args[]) { StringBuffer s = new StringBuffer(".ymene tsrow sih si nam yrevE"); System.out.println("原来s="+s.toString()); StringBuffer buffer = new StringBuffer(); buffer = s; buffer.reverse(); System.out.println("反转后s="+buffer.toString()); } }
大小写互换,public class hello7 { public static void main(String[]args){ StringBuilder sb=new StringBuilder(); String str="A Hello,this is a test"; char[]arr=str.toCharArray(); for(char c:arr){ int s=(int)c; if('A'<=c&&c<='Z'){ s+=32; }else if('a'<=c&&c<='z'){ s+=-32; } sb.append((char)s); } System.out.println("元字符串:"+str); System.out.println("转换后串:"+sb); } }
Test7 反转的 其他的楼主自己学吧! public class StringTest{ public void convert(String s){ for(int i= s.length()-1;i>=0;i--){ System.out.print(s.charAt(i)); } System.out.println (); } public static void main(String[] args){ String s = ".ymene tsrow sih si nam yrevE"; StringTest st = new StringTest(); System.out.println ("发转前的字符串是:"); System.out.println (s); System.out.println ("发转后的字符串是:"); st.convert(s); } }
public static void main(String[] args) { String ymd1 = "2009-05-01";
String ymd2 = "2009-06-01";
Date d1 = null;
Date d2 = null;
try {
d1 = getDate(ymd1);
d2 = getDate(ymd2);
} catch (ParseException e) {
System.out.println("Cannot parse the date pattern");
e.printStackTrace();
}
System.out.println("There are " + getDays(d1,d2) + " days between " + ymd1 + " and " + ymd2);
} private static Date getDate(String date) throws ParseException {
return new SimpleDateFormat("yyyy-MM-dd").parse(date);
}
private static long getDays(Date d1, Date d2) {
long resultDays = 0;
resultDays = Math.abs((d1.getTime() - d2.getTime())/3600000/24);
return resultDays;
}
import java.util.Iterator;//找出两个字符串中所有相同的字符。public class test{
public static void main(String args[]){
String str1="abcdefghijkhlhc";
String str2="hjggjkhuabcdio";
HashSet h=new HashSet();char[] ch1=str1.toCharArray();
char[] ch2=str2.toCharArray();
System.out.println("两个字符串相同字符如下:");
for(int i=0;i<ch1.length;i++){
for(int j=0;j<ch2.length;j++){
if(ch1[i]==ch2[j]){
h.add(ch1[i]);
// System.out.println(ch1[i]);
}
}
}
Iterator it=h.iterator();
while(it.hasNext()){
// it.next();
System.out.println(it.next());
}}
//6 分析输出字符串中的单词,并统计单词个数import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.swing.JOptionPane;public class Test {
public static void main(String[] args) {
String s = JOptionPane.showInputDialog(null, "请输入句子:");
String[] ss = s.trim().split(" ");
Map map = new HashMap(); for (int i = 0; i < ss.length; i++) {
int count = 0;
for (int j = 0; j < ss.length; j++) {
if (ss[i].equals(ss[j])) {
count = count + 1;
}
}
map.put(ss[i], count);
}
Set key=map.keySet();
for (Iterator iterator = key.iterator(); iterator.hasNext();) {
String name = (String) iterator.next();
String count2=map.get(name).toString();
System.out.println(name+"有 "+count2+" 个");
}
}
}
大哥,那是让反转,不是排序。用StringBuffer的reverse()方法就哦了。LZ肯定是懒得做作业。
楼主可能在准备笔试,或者是其他的东西。不过,最终你要自己完成编码。还是自己来吧。会有提高的!~
public class hello7
{
public static void main(String[]args){
String s=".ymene tsrow sih si nam yrevE";
char[]arr=s.toCharArray();
StringBuilder sb=new StringBuilder();
for(int i=arr.length-1;i>=0;i--){
sb.append(arr[i]);
}
System.out.println("元字符串:"+s);
System.out.println("转换后串:"+sb);
}
}
//反转字符串中的字符
public class StringBufferOp
{
public static void main(String args[])
{
StringBuffer s = new StringBuffer(".ymene tsrow sih si nam yrevE");
System.out.println("原来s="+s.toString());
StringBuffer buffer = new StringBuffer();
buffer = s;
buffer.reverse();
System.out.println("反转后s="+buffer.toString());
}
}
{
public static void main(String[]args){
StringBuilder sb=new StringBuilder();
String str="A Hello,this is a test"; char[]arr=str.toCharArray();
for(char c:arr){
int s=(int)c;
if('A'<=c&&c<='Z'){
s+=32;
}else if('a'<=c&&c<='z'){
s+=-32;
}
sb.append((char)s);
} System.out.println("元字符串:"+str);
System.out.println("转换后串:"+sb);
}
}
public class StringTest{ public void convert(String s){
for(int i= s.length()-1;i>=0;i--){
System.out.print(s.charAt(i));
}
System.out.println ();
} public static void main(String[] args){
String s = ".ymene tsrow sih si nam yrevE";
StringTest st = new StringTest();
System.out.println ("发转前的字符串是:");
System.out.println (s);
System.out.println ("发转后的字符串是:");
st.convert(s); }
}
已过时。 从 JDK 1.1 开始,由 Calendar.get(Calendar.DAY_OF_MONTH) 取代。
StringBuffer sb1 = new StringBuffer("abcdefg");
StringBuffer sb2 = new StringBuffer("qclemao");
StringBuffer sb3 = new StringBuffer("");
for (int i=0;i<sb1.length();i++) {
for (int j=0;j<sb2.length();j++) {
if (sb1.charAt(i) == sb2.charAt(j)) {
sb3.append(sb1.charAt(i));
}
}
}
System.out.println(sb3);
}
}
public class Test2 { public static void main(String[] args) {
StringBuffer sb1 = new StringBuffer("qmazlcAfebQCbcejkd");
int a = sb1.length();
byte[] cc = new byte[a];
for (int i=0;i<sb1.length();i++) {
cc[i] = (byte)sb1.charAt(i);
}
for (int i=0;i<cc.length;i++) {
for (int j=i;j<cc.length;j++) {
byte temp = 0;
if (cc[i]>cc[j]) {
temp = cc[i];
cc[i] = cc[j];
cc[j] = temp;
}
}
}
for (int i=0;i<cc.length;i++) {
System.out.print((char)cc[i] + " ");
}
}
}实现了两个我自认识比较难一点的。其他的楼主自己实现吧。
package csdn;
import java.util.*;
public class ArraysT { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int[] n1 = { 2, 3, 1, 4, 6, 5, 7, 9, 8, 0 };
Arrays.sort(n1);
System.out.println(Arrays.toString(n1));
}}
package csdn;
import java.util.*;
public class ArraysT { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int[] n1 = { 2, 3, 1, 4, 6, 5, 7, 9, 8, 0 };
Arrays.sort(n1);//返回类型为void
System.out.println(Arrays.toString(n1));
}}可以输出结果为:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]