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int k = i;
for ( j = i ; j < a.length ; j++ )
if ( a[j]<a[k] ) k = j;
int temp =a[i];
a[i] = a[k];
a[k] = temp;
}
for ( i =0 ; i<a.length; i++ )
System.out.print(a[i]+" ");
System.out.println( );
}
}
3.写出以下程序的功能。
import java.io.*;
public class TestFile
{
public static void main(String args[]) throws Exception
{
BufferedReader br = new BufferedReader(
new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new FileWriter(“input.txt"));
String s;
while (true)
{
System.out.print("请输入一个字符串: ");
System.out.flush();
s=br.readLine();
if (s.length()==0) break;
bw.write(s);
bw.newLine();
}
bw.close();
}