小弟求求各位大神帮我解决一道java笔试题

superlikailai 2012-06-16 10:44:09

请读写一段代码，将下面的句子的语序颠倒：
“Long long ago, there lived a king ”
提示（即把上述句子变成“king a lived there ， ago long Long”）

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xlhb 2012-06-18

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public class CSDN1 {
public static void main(String[] args) {
String str = "Long long ago , there lived a king";
String[] ss = str.split(" ");
for(int i=ss.length-1; i>=0; i--){
System.out.print(ss[i] + " ");
}
}

}

xlhb 2012-06-18

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NullPointException 2012-06-17

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[Quote=引用 1 楼的回复:]

public class CSDN1 {
public static void main(String[] args) {
String str = "Long long ago , there lived a king";
String[] ss = str.split(" ");
for(int i=ss.length-1; i>=0; i--){
System.out.print……
[/Quote]
改了下，还是可以的...



public static void main(String[] args) {

        String str = "Long long ago, there lived a king";

	String[] ss=str.split(",");

	str=ss[0]+" ,"+ss[1];

	ss=str.split(" ");

	for(int i=ss.length-1; i>=0; i--) System.out.print(ss[i] +" ");		 

	}

夜空中苦逼的程序员 2012-06-17

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看来正则表达式真的好强大，以后要好好学习了~~

Edward1688 2012-06-17

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正则厉害！！

keeya0416 2012-06-17

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先把整个字符串的颠倒换过来（双指针分别指向首尾，一个递增一个递减，两两交换即可。）
完事再将空格间的字符局部颠倒回来即可。

jerrygr_ok 2012-06-16

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[Quote=引用 4 楼的回复:]

for example
Java code
String s = "Long long ago, there lived a king";
String[] sa = s.split("(?=,)|\\s+");
for (int i=sa.length-1; i>=0; i--) {
System.out.printf("%s ", sa[i]);
}

稳妥一点,可以用正则……
[/Quote]
+1

qybao 2012-06-16

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for example

String s = "Long long ago, there lived a king";

String[] sa = s.split("(?=,)|\\s+");

for (int i=sa.length-1; i>=0; i--) {

    System.out.printf("%s ", sa[i]);

}

稳妥一点,可以用正则



import java.util.regex.*;



String s = "Long long ago, there lived a king";

Matcher m = Pattern.compile("\\w+|,").matcher(s);

List<Strint> list = new ArrayList<String>();

while (m.find()) {

    list.add(m.group());

}

for (int i=list.size()-1; i>=0; i--) {

    System.out.printf("%s ", list.get(i));

}