Java 常用类

数组copy类：

public class TestArrayCopy{
        public static void main(String[] args){
            String[] s={"Microsoft","Apple","Google","Baidu"};
            String[] sbak=new String[6];
            System.arraycopy(s,0,sbak,0,s.length);
            int i=0;
            while(sbak[i]!=null){
                System.out.print(sbak[i]+" ");
                i++;
                }

        }
    }