Question

Java String类的构造方法求大神教

import javax.swing.*;

public class StringTest {
String string1,string2,string3,string4;
byte[]byte1={72,101,108,111,32,110,101,119,32,87,111,114,108,100};
char[]char2={'H','e','l','l','o',' ','n','e','w',' ','w','o','r','d'};

public StringTest(){
string1=new String();
string2=new String(byte1,6,9);
string3=new String(char2,0,5);
string4=JOptionPane.showInputDialog("Input a String:");

System.out.println();
System.out.println("String1:"+string1);
System.out.println("String2:"+string2);
System.out.println("String3:"+string3);
System.out.println("String4:"+string4);
}

public static void main(String args[]){
StringTest st=new StringTest();
System.exit(-1);
}
}
报错找不到

Answer 1

string2=new String(byte1,6,9);这个错了，最后一个参数是指定要截取的数组的长度，而不是指最后一个byte的索引，若要取byte1的第6-9数组成员，用new String(byte1,6,3);

追问

谢谢

Answer 2

string2=new String(byte1,6,9); 你的byte1这个数组长度为14，6+9=15当然会数组越界啦