怎样给一个String变量的一部分赋值

[ruanjin]

比如String aaa="0000111";
我要把111换成000怎么搞?

[lydvqq]

aaa.repalceAll("111","000");

[tomuno]

class Test1
{
public static void main(String args[])
{
System.out.println("0000111".replaceAll("1", "0"));
}
}

[ruanjin]

呵呵,不行,我要定位到第几位到第几位赋值.不是替换!

[lydvqq]

String aaa = "kdkdk";
StringBuffer sbuf = new StringBuffer();
sbuf.append(aaa);
System.out.println(sbuf.replace(1,2,"T"));

[lyazure]

转成char数组:
String aaa = "0000111";
char[] bbb = aaa.toCharArray();
for(int i = 0; i<3; i++)bbb[i] = 1;
aaa = new String(bbb);
如果用BitSet能满足要求的话不妨用BitSet
BitSet bitSet= new BitSet(7);
bitSet.set(4, 7);//0000111
bitSet.set(2);//0010111
bitSet.clear(5);//0010101

[yoyodd]

灵活运用String的方法：
indexOf和subString