JAVA 关于String方面的

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class test1 {
public static void main(String args[]){
System.out.print("请输入数字：");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
try {
String line = br.readLine();
int h = Integer.parseInt(line);
String s = "A";
StringBuffer t = new StringBuffer();
for(int i = 0;i < h;i++){
t.append(s);
}
System.out.println(t);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

我这是最完整的

祝你好运

String s="A";
StringBuffer sb=new StringBuffer();
for(int inti=0;i<20;i++)
{
sb.append(s);
}
System.out.println(sb);

即可.

String s="A";
String t ;
StringBuffer ss= new