String定义字符串,实际操作

package hello;

public class finallianxi {

    public static void main(String[] args) {
        String Strname = "一二三四";
        System.out.println(Strname);
        int a = 1;
        System.out.println(a);
        final double PEI = 3.14;
        System.out.println(PEI);
        String a1=("hello");
        String a3=("world");
        String a2=a1;
        System.out.println(a1);
        System.out.println(a2);


    }

}