java练习02

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我是靠谱客的博主淡定路灯，最近开发中收集的这篇文章主要介绍java练习02，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

package Chapter02;

import com.sun.net.httpserver.Filter;

public class Practice01 {
public static void main(String[] args) {
char chinaWord = ‘好’;
char japanWord = ‘差’;
char you = ‘u4F60’;
int position = 20320;
System.out.println(“汉字：”+chinaWord+“的位置：”+(int)chinaWord);
System.out.println(“日文：”+japanWord+“的位置：”+(int)japanWord);
System.out.println(position+“位置上的字符是：”+(char)position);
position = 21319;
System.out.println(position+“位置上的字符是：”+(char)position);
System.out.println(“you：”+you);
}
}

//#####################################

package Chapter02;

public class Practice02 {
public static void main(String[] args) {
byte b = 22;
int n = 129;
float f = 123456.6789f;
double d = 123456789.123456789;
System.out.println("b = "+b);
System.out.println("n = "+n);
System.out.println("f = "+f);
System.out.println("d = "+d);
b = (byte) n; //导致精度缺失
f = (float) d;//导致精度缺失
System.out.println("b = "+b);
System.out.println("f = "+f);
}
}

//由低到高：byte,short,char->int->long->float->double

//#####################################

package Chapter02;

import java.io.Reader;
import java.util.Scanner;

public class Practice03 {

public static void main(String[] args) {
    System.out.println("输入若干个数，每输入一个数回车确认");
    System.out.println("最后输入数字0结束操作");
    Scanner = Reader = new Scanner(System.in);
    double sum = 0;
    double x = Reader.nextDouble();
    while (x != 0) {
        sum = sum + x;
        x = Reader.nextDouble;
    }
    System.out.println("sum = " + sum);
}

}//public class YL01 {