public class HomeWork03 {
public static void main(String[] args) {
String str = "ABCDEFGHIJK";
for(int i=0; i<str.length(); i++){
for(int j=i; j<(i+8 > str.length() ? str.length() : i+8); j++){
System.out.print(str.substring(i, j+1));
System.out.println();
}
System.out.println();
}
}
}
输出：
A AB ABC ABCD ABCDE ABCDEF ABCDEFG ABCDEFGH B BC BCD BCDE BCDEF BCDEFG BCDEFGH BCDEFGHI C CD CDE CDEF CDEFG CDEFGH CDEFGHI CDEFGHIJ D DE DEF DEFG DEFGH DEFGHI DEFGHIJ DEFGHIJK E EF EFG EFGH EFGHI EFGHIJ EFGHIJK F FG FGH FGHI FGHIJ FGHIJK G GH GHI GHIJ GHIJK H HI HIJ HIJK I IJ IJK J JK K
原文：http://www.cnblogs.com/houxudong/p/7275839.html