Java从入门到实战之（25）Java图形打印之练习

1、菱形

package Java_Learn.File;
public class Main1 {
    public static void main(String[] args) {
        print(8);
    }
    //菱形
    public static void print(int size) {
        if (size % 2 == 0) {
            size++; // 计算菱形大小
        }
        for (int i = 0; i < size / 2 + 1; i++) {
            for (int j = size / 2 + 1; j > i + 1; j--) {
                System.out.print(" "); // 输出左上角位置的空白
            }
            for (int j = 0; j < 2 * i + 1; j++) {
                System.out.print("*"); // 输出菱形上半部边缘
            }
            System.out.println(); // 换行
        }
        for (int i = size / 2 + 1; i < size; i++) {
            for (int j = 0; j < i - size / 2; j++) {
                System.out.print(" "); // 输出菱形左下角空白
            }
            for (int j = 0; j < 2 * size - 1 - 2 * i; j++) {
                System.out.print("*"); // 输出菱形下半部边缘
            }
            System.out.println(); // 换行
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=51541:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appWorkSpace	argetclasses;C:Program Files (x86)scalalibscala-actors-2.11.0.jar;C:Program Files (x86)scalalibscala-actors-migration_2.11-1.1.0.jar;C:Program Files (x86)scalalibscala-library.jar;C:Program Files (x86)scalalibscala-parser-combinators_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-reflect.jar;C:Program Files (x86)scalalibscala-swing_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-xml_2.11-1.0.1.jar;C:
epositoryorgscala-langscala-library2.11.0scala-library-2.11.0.jar" Java_Learn.File.Main1
    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *

Process finished with exit code 0

2、乘法表

package Java_Learn.File;
public class Main1 {
    public static void main(String[] args) {
//        实现20*20的乘法表
        print(20);
    }
    //乘法表
    public static void print(int size) {
        for (int i=1;i<=size;i++)
        {
            for (int j=1;j<=i;j++)
            {
                System.out.print(j+"×"+i+"="+i*j+"	");
            }
            System.out.println();
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=51728:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appWorkSpace	argetclasses;C:Program Files (x86)scalalibscala-actors-2.11.0.jar;C:Program Files (x86)scalalibscala-actors-migration_2.11-1.1.0.jar;C:Program Files (x86)scalalibscala-library.jar;C:Program Files (x86)scalalibscala-parser-combinators_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-reflect.jar;C:Program Files (x86)scalalibscala-swing_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-xml_2.11-1.0.1.jar;C:
epositoryorgscala-langscala-library2.11.0scala-library-2.11.0.jar" Java_Learn.File.Main1
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    
1×10=10    2×10=20    3×10=30    4×10=40    5×10=50    6×10=60    7×10=70    8×10=80    9×10=90    10×10=100    
1×11=11    2×11=22    3×11=33    4×11=44    5×11=55    6×11=66    7×11=77    8×11=88    9×11=99    10×11=110    11×11=121    
1×12=12    2×12=24    3×12=36    4×12=48    5×12=60    6×12=72    7×12=84    8×12=96    9×12=108    10×12=120    11×12=132    12×12=144    
1×13=13    2×13=26    3×13=39    4×13=52    5×13=65    6×13=78    7×13=91    8×13=104    9×13=117    10×13=130    11×13=143    12×13=156    13×13=169    
1×14=14    2×14=28    3×14=42    4×14=56    5×14=70    6×14=84    7×14=98    8×14=112    9×14=126    10×14=140    11×14=154    12×14=168    13×14=182    14×14=196    
1×15=15    2×15=30    3×15=45    4×15=60    5×15=75    6×15=90    7×15=105    8×15=120    9×15=135    10×15=150    11×15=165    12×15=180    13×15=195    14×15=210    15×15=225    
1×16=16    2×16=32    3×16=48    4×16=64    5×16=80    6×16=96    7×16=112    8×16=128    9×16=144    10×16=160    11×16=176    12×16=192    13×16=208    14×16=224    15×16=240    16×16=256    
1×17=17    2×17=34    3×17=51    4×17=68    5×17=85    6×17=102    7×17=119    8×17=136    9×17=153    10×17=170    11×17=187    12×17=204    13×17=221    14×17=238    15×17=255    16×17=272    17×17=289    
1×18=18    2×18=36    3×18=54    4×18=72    5×18=90    6×18=108    7×18=126    8×18=144    9×18=162    10×18=180    11×18=198    12×18=216    13×18=234    14×18=252    15×18=270    16×18=288    17×18=306    18×18=324    
1×19=19    2×19=38    3×19=57    4×19=76    5×19=95    6×19=114    7×19=133    8×19=152    9×19=171    10×19=190    11×19=209    12×19=228    13×19=247    14×19=266    15×19=285    16×19=304    17×19=323    18×19=342    19×19=361    
1×20=20    2×20=40    3×20=60    4×20=80    5×20=100    6×20=120    7×20=140    8×20=160    9×20=180    10×20=200    11×20=220    12×20=240    13×20=260    14×20=280    15×20=300    16×20=320    17×20=340    18×20=360    19×20=380    20×20=400    

Process finished with exit code 0

3、正立的等腰三角形

package Java_Learn.File;
public class Main1 {
    public static void main(String[] args) {
        print(10);
    }
    //三角形
    public static void print(int size) {
        for(int i=1;i<=size;i++){
            for(int j=size; i<=j; j--)
                System.out.print(" ");
            for(int j=1; j<=i; j++)
                System.out.print("*");
            for(int j=1; j<i; j++)
                System.out.print("*");
            System.out.println();
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=51784:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appWorkSpace	argetclasses;C:Program Files (x86)scalalibscala-actors-2.11.0.jar;C:Program Files (x86)scalalibscala-actors-migration_2.11-1.1.0.jar;C:Program Files (x86)scalalibscala-library.jar;C:Program Files (x86)scalalibscala-parser-combinators_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-reflect.jar;C:Program Files (x86)scalalibscala-swing_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-xml_2.11-1.0.1.jar;C:
epositoryorgscala-langscala-library2.11.0scala-library-2.11.0.jar" Java_Learn.File.Main1
          *
         ***
        *****
       *******
      *********
     ***********
    *************
   ***************
  *****************
 *******************

Process finished with exit code 0

4、倒立等腰三角形

package Java_Learn.File;
public class Main1 {
    public static void main(String[] args) {
        print(10);
    }
    //三角形
    public static void print(int size) {
        for (int i = size - 1; i >= 0; i--) {
            for (int j = 0; j < (size - 1) - i; j++) {
                System.out.print(" ");
            }
            for (int j = 0; j < 2 * i + 1; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=51841:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appWorkSpace	argetclasses;C:Program Files (x86)scalalibscala-actors-2.11.0.jar;C:Program Files (x86)scalalibscala-actors-migration_2.11-1.1.0.jar;C:Program Files (x86)scalalibscala-library.jar;C:Program Files (x86)scalalibscala-parser-combinators_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-reflect.jar;C:Program Files (x86)scalalibscala-swing_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-xml_2.11-1.0.1.jar;C:
epositoryorgscala-langscala-library2.11.0scala-library-2.11.0.jar" Java_Learn.File.Main1
*******************
 *****************
  ***************
   *************
    ***********
     *********
      *******
       *****
        ***
         *

Process finished with exit code 0

5、平行四边形

package Java_Learn.File;
public class Main1 {
    public static void main(String[] args) {
        print(10);
    }
    //平行四边形
    public static void print(int size) {
        //外层循环 每次打出一个*
        for (int i = 1; i <=size; i++) {
            //填充空格
            for (int j = 1; j <= size - i; j++) {
                System.out.print(" ");
            }
            //内层循环 每次打印一个*
            for (int k = 1; k <= 5; k++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
        }

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=51874:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appWorkSpace	argetclasses;C:Program Files (x86)scalalibscala-actors-2.11.0.jar;C:Program Files (x86)scalalibscala-actors-migration_2.11-1.1.0.jar;C:Program Files (x86)scalalibscala-library.jar;C:Program Files (x86)scalalibscala-parser-combinators_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-reflect.jar;C:Program Files (x86)scalalibscala-swing_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-xml_2.11-1.0.1.jar;C:
epositoryorgscala-langscala-library2.11.0scala-library-2.11.0.jar" Java_Learn.File.Main1
         *****
        *****
       *****
      *****
     *****
    *****
   *****
  *****
 *****
*****

Process finished with exit code 0

6、矩形

package Java_Learn.File;
public class Main1 {
    public static void main(String[] args) {
        print(10);
    }
    //矩形
    public static void print(int size) { //外层循环 每次输出一行*
        for (int i = 1; i <= 5; i++) {
            System.out.print("*");
            //内层循环 每次输出一个*
            for (int j = 1; j <= 5; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=51910:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appWorkSpace	argetclasses;C:Program Files (x86)scalalibscala-actors-2.11.0.jar;C:Program Files (x86)scalalibscala-actors-migration_2.11-1.1.0.jar;C:Program Files (x86)scalalibscala-library.jar;C:Program Files (x86)scalalibscala-parser-combinators_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-reflect.jar;C:Program Files (x86)scalalibscala-swing_2.11-1.0.1.jar;C:Program Files (x86)scalalibscala-xml_2.11-1.0.1.jar;C:
epositoryorgscala-langscala-library2.11.0scala-library-2.11.0.jar" Java_Learn.File.Main1
******
******
******
******
******

Process finished with exit code 0