java数据类型及对应源码分享

import java.util.Scanner;

public class test{

public static void main(String[] args){

Scanner scan=new Scanner(System.in);

System.out.println("whose your daddy?");

String name=scan.next();

if(name.equals("yangfei")){

System.out.println("are you sure?(y/n)");

String yn=scan.next();

if (yn.equals("y")){

System.out.println("great!");

}else{

System.out.println("cheater!");

}

}else {

System.out.print("you wrong!"+name+" is not your daddy!");

}

System.out.println("yangfei is your daddy!");

}

}

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框架：

public class test{

public static void main(String[] args){

}

}

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数据类型：

char 单字符

int 整数

String 字符串

double 小数点

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输出：

System.out.println("");

// \n换行 \t tab

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输入：

import java.util.Scanner;

import java.util.*;

//导入Scanner

Scanner in=new Scanner(System.in);

//赋值给in system.in属性输入 system.out属性输出

in.nextInt() 整数

in.nextDouble() 小数

in.next() 字符串

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boolean

boolean c;

c=A==B;

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