lx3_23.java

jbuilder2005

//lx3_23.java
public class lx3_23{
    public static void main(String args[]) {
        String s1 = new String("Welcome to Java!");
        System.out.println("字符串长度:" + s1.length());
        String s2 = new String("这里是中国。");
        int i=2005;
        String s3=new String();
        s3=Integer.toString(i);          //将整型数转换为字符串
        String s4 = new String();
        s4=s1.substring(3,7);            //截取s1字串，从第4个字符截取到第8个
        float x;
        x=Float.parseFloat("2.14");      //将数值型字串转换浮点型
        x++;                             //进行数字运算
        System.out.println(s3+s4+x+s2);  //字符串与其它类型变量连接成新字符串
    }
}