Java - Linux 上的命令行：运行代码后我没有任何 output

Question

I am a beginner user of command-line. I use Eclipse for my optimization problem with cplex.jar on my computer. Since my computer is not enough for big problems, I try to use the school Linux server. I finally found a code piece that works without an error. However, after I run this, I don't see anything(solving something etc). Could you please help me to understand why I see nothing after this?

Before this code, I had many errors about my java files, my argument, jar file etc.

javac -source "1.8" -cp ".:./PDP-TWT2/cplex.jar" PDP-TWT2/src/MainPDP2.java PDP-TWT2/src/Node.java PDP-TWT2/src/Vehicle.java PDP-TWT2/src/Arc.java < "PDP-TWT2/Param.txt"

When I run my code, I see the following in Eclipse. I believe this is what I supposed to see in the server right?

 **************************************************.
Warning:  Output names have been modified to conform to LP format.
Tried aggregator 2 times.
MIP Presolve eliminated 1604 rows and 96 columns.
MIP Presolve modified 244 coefficients.
Aggregator did 180 substitutions.
Reduced MIP has 3299 rows, 1970 columns, and 11256 nonzeros.
Reduced MIP has 1942 binaries, 0 generals, 0 SOSs, and 0 indicators.
Presolve time = 0.01 sec. (11.67 ticks)
Probing fixed 12 vars, tightened 0 bounds.

...Many other similar lines...

        Nodes                                         Cuts/
   Node  Left     Objective  IInf  Best Integer    Best Bound    ItCnt     Gap

      0     0       35.5800    72                     35.5800      891         
      0     0       36.3600    90                    Cuts: 68     1290         
      0     0       36.3600   102                    Cuts: 68     1644

Answer 1

You need to first compile and then execute the application. Assuming that you have src directory with sources and out directory for compiled classes:

$ cd PDP-TWT2
$ javac -source 1.8 -d ./out src/**/*.java 

and then execute the class containing the main() method:

$ cd out
$ java MainPDP2 < ../Param.txt

Checkout Essentials, Part 1, Lesson 1: Compiling & Running a Simple Program if want to learn more. If you are using Java 11 this whole process is simplified with JEP 330: Launch Single-File Source-Code Programs .