java 项目实战教程代码

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1、publicclasszl{publicstaticvoidmain(String[]args){//Integerx1=newInteger(2);Integerx1=newInteger(2);Integerx2=newInteger(2);System.out.println("x1==x2="+(x1==x2));System.out.println("x1!=x2="+(x1!=x2));}}importjava.util.Scanner;publicclassStu{publicstaticvoid

2、main(String[]args){//shurumimaSystem.out.println("系统注册");Scannerinput=newScanner(System.in);System.out.println("请输入您的密码:");Stringpswl=input.next();System.out.println("请确认您的密码");Stringpsw2=input.next();if(pswl.equals(psw2)){System.out.println("输入对的");}else{Sy

3、stem.out.println("两次密码不对，请重新输入");}}}importjava.util.Scanner;publicclassTest1{publicstaticvoidmain(String[]args){booleanemailCorrect=false;System.out.println("---欢迎注册---");Scannerinput=newScanner(System.in);System.out.println("请输入你的邮箱：");Stringemail=input.nex

4、t();if(email.indexOf('@')!=-1&&email.indexOf('.')>email.indexOf('@')){emailCorrect=true;}else{System.out.println("email无效.");}if(emailCorrect){System.out.println("email地址符合要求！");}else{System.out.println("请重新输入email!");}}}importjava.io.IOException;publicclass

5、Test2{publicstaticvoidmain(String[]args)throwsIOException{intc;System.out.println("请输入名次:");c=(char)System.in.read();switch(c){case'1':System.out.println("冠军!");break;case'2':System.out.println("亚军!");break;case'3':System.out.println("季军!");break;default:Sys

6、tem.out.println("抱歉，没有上榜或输入错误!");}}}publicclassArrayDefault{publicstaticvoidmain(String[]args){intage[]=newint[4];System.out.println("age[1]的默认初始值为:"+age[1]);}}importjava.util.Arrays;publicclassArrayTest{publicstaticvoidmain(String[]args){int[]age={23,20,25,

7、19};Arrays.sort(age);System.out.println("排序后数组为：");for(inti=0;i