String s= "helloworld";
System.out.println(s.length());
System.out.println(s.charAt(4));
char n = s.charAt(4);
System.out.println(n);
System.out.println(s.indexOf("o",5));
System.out.println(s.substring(0));
System.out.println(s.substring(0,s.length()));
char[] ch = s.toCharArray();
for (int i = 0 ; i <ch.length;i++)
{
System.out.println(ch[i]);
}
String ss=String.valueOf(ch);
System.out.println(ss);
int[] arr = {1,2,3};
String s="";
s+="[";
for (int i =0; i <arr.length;i++){
if (i<arr.length-1){
s+=arr[i];
s+=",";
}
else {
s+=arr[i];
s+="]";
}
}
System.out.println(s);
String maxString = "woaijavawozhenaijavawozhendeaijavawozhendehenaijavaxinbuxinwoaijavagun";
String minString = "java";
int count = 0;
int index;
while ((index=maxString.indexOf(minString))!=-1)
{
count++;
maxString = maxString.substring(index + minString.length());
}
System.out.println(count);
-
将一个数字字符串转换成逗号分隔的数字串,即从右边开始每三个数字用逗号分隔
Scanner scanner = new Scanner(System.in);
String shu = scanner.next();
String y =shu.substring(shu.length()-3,shu.length());
String r =shu.substring(shu.length()-6,shu.length()-3);
String h =shu.substring(0,shu.length()-6);
System.out.println(h+","+r+","+y);
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