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java编写输出一个字符串中大写英文字母数、小写英文字母数以及非英文字母数

2011-09-04 14:49 597 查看

下面用了三种算法实现，执行效率逐渐提高...

第一种：

public class TestString
{
public static void main(String[] args)
{
String s = "AdaaaaABBBBdkajfdkfj4dasdWWSDS53#$#addasdfkjsakfls_kjdksADKDJ";
int lCount = 0, uCount = 0, oCount = 0;
for(int i = 0; i < s.length(); i++)
{
char c = s.charAt(i);
if(c >= 'a' && c <= 'z')
{
lCount++;
}
else if(c >= 'A' && c <= 'Z')
{
uCount++;
}
else
{
oCount++;
}
}
System.out.println(lCount + " " + uCount + " " + oCount);
}
}

第二种：

public class TestString
{
public static void main(String[] args)
{
String s = "AdaaaaABBBBdkajfdkfj4dasdWWSDS53#$#addasdfkjsakfls_kjdksADKDJ";
int lCount = 0, uCount = 0, oCount = 0;

String sL = "abcdefghijklmnopqrstuvwxyz";
String sU = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
for(int i = 0; i <s.length(); i++)
{
char c = s.charAt(i);
if(sL.indexOf(c) != -1)
{
lCount++;
}
else if(sU.indexOf(c) != -1)
{
uCount++;
}
else
{
oCount++;
}
}
System.out.println(lCount + " " + uCount + " " + oCount);
}
}

第三种：

public class TestString
{
public static void main(String[] args)
{
String s = "AdaaaaABBBBdkajfdkfj4dasdWWSDS53#$#addasdfkjsakfls_kjdksADKDJ";
int lCount = 0, uCount = 0, oCount = 0;

for(int i = 0; i < s.length(); i++)
{
char c = s.charAt(i);
if(Character.isLowerCase(c))
{
lCount++;
}
else if(Character.isUpperCase(c))
{
uCount++;
}
else
{
oCount++;
}
}
System.out.println(lCount + " " + uCount + " " + oCount);
}
}

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标签： java string class c 算法

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