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class 九九乘法表
{
int x; // 如果不在for循环外定义,编译失败
int y; //如果不在for循环外定义,编译失败
void study()
{
for (y=1;y<=9;y++)
{
for( x=1;x<=y;x++)
{
System.out.print(x+"*"+y+"="+(x*y));
System.out.print("\t");
}
System.out.println();
}
}
}
class Shengfabiao
{
public static void main(String[] args)
{
for (int y=1;y<=9;y++)
{
for(int x=1;x<=y;x++)
{
System.out.print(x+"*"+y+"="+(x*y));
System.out.print("\t");
}
System.out.println();
}
}
}
class 九九乘法表
{
void study()
{
int x; // 如果不在for循环外定义,编译失败
int y; //如果不在for循环外定义,编译失败
for (y=1;y<=9;y++)
{
for( x=1;x<=y;x++)
{
System.out.print(x+"*"+y+"="+(x*y));
System.out.print("\t");
}
System.out.println();
}
}
}
试试public class TestVar{
public static void main(String[] args) {
Testt testt = new Testt();
testt.study();
}
}
class Testt
{
public void study()
{
for (int y=1;y<=9;y++)
{
for(int x=1;x<=y;x++)
{
System.out.print(x+"*"+y+"="+(x*y));
System.out.print("\t");
}
System.out.println();
}
}
}
结果:
C:\Softwave\Work\Java\Jdk1.8\bin\java.exe "-javaagent:C:\Softwave\Work\IDE\IntelliJ IDEA 2018.1.3\lib\idea_rt.jar=53754:C:\Softwave\Work\IDE\IntelliJ IDEA 2018.1.3\bin" -Dfile.encoding=UTF-8 -classpath C:\Softwave\Work\Java\Jdk1.8\jre\lib\charsets.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\deploy.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\access-bridge-64.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\cldrdata.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\dnsns.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\jaccess.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\jfxrt.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\localedata.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\nashorn.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\sunec.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\sunjce_provider.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\sunmscapi.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\sunpkcs11.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\ext\zipfs.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\javaws.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\jce.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\jfr.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\jfxswt.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\jsse.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\management-agent.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\plugin.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\resources.jar;C:\Softwave\Work\Java\Jdk1.8\jre\lib\rt.jar;D:\WorkResource\WorkSpace\IDEA\Test\Init\out\production\Init;D:\WorkResource\WorkSpace\IDEA\Test\Init\lib\fastjson-1.2.32.jar;D:\WorkResource\WorkSpace\IDEA\Test\Init\lib\commons-beanutils-1.9.3.jar TestVar
1*1=1
1*2=2 2*2=4
1*3=3 2*3=6 3*3=9
1*4=4 2*4=8 3*4=12 4*4=16
1*5=5 2*5=10 3*5=15 4*5=20 5*5=25
1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36
1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49
1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64
1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81
Process finished with exit code 0
class 九九乘法表 //这是错误代码
{
void study()
{
for (int y=1;y<=9;y++)
{
for(int x=1;x<=y;x++)
{
System.out.print(x+"*"+y+"="+(x*y));
System.out.print("\t");
}
System.out.println();
}
}
}