3 added 34 characters in body
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You can see the number 2800 ( actually it means 28 millions ), even if you can not read Japanese.

You can see the number 2800, even if you can not read Japanese.

You can see the number 2800 ( actually it means 28 millions ), even if you can not read Japanese.

2 added 170 characters in body
source | link
  1. From this source

    Data comparison ( From 1941 to 1945 )

    From this source

Data comparison ( From 1941 to 1945 )

JIA 1941 2.42 million 1945 8.26 million The U.S 1941 1.88 million 1945 12.297 million

JIA

1941 2.42 million

1945 8.26 million

The U.S

1941 1.88 million

1945 12.297 million

( Hereunder let me call million --> mil ( and the abbreviated explanation will be subject to the former ( 1941's ))

JIA 1941 148mil tons ( The number of vessels 385 ), 1945 70.8 mil ( 341 ) The U.S 1941 131.3mil ( 341 vessels ), 1945 427.2mil ( 918 )

JIA

1941 148mil tons ( The number of vessels 385 ),

1945 70.8 mil ( 341 )

The U.S

1941 131.3mil ( 341 vessels ),

1945 427.2mil ( 918 )

JIA 1941 4,772 1945 10,938 The U.S 1941 12,240 1945 40,810

JIA

1941 4,772

1945 10,938

The U.S

1941 12,240

1945 40,810

JIA 1940 30 million tons 1945 22mil The U.S 1940 18,286.7 mil 1945 23,175 mil

JIA

1940 30 million tons

1945 22 mil

The U.S

1940 18,286.7 mil

1945 23,175 mil

JIA 1940 365.8 million tons 1945 103.9 mil The U.S 1940 4,302.7mil 1945 4,985.5 mil

JIA

1940 365.8 million tons

1945 103.9 mil

The U.S

1940 4,302.7mil

1945 4,985.5 mil

  1. From this source

    Data comparison ( From 1941 to 1945 )

JIA 1941 2.42 million 1945 8.26 million The U.S 1941 1.88 million 1945 12.297 million

( Hereunder million --> mil ( and the abbreviated explanation will be subject to the former ( 1941's ))

JIA 1941 148mil tons ( The number of vessels 385 ), 1945 70.8 mil ( 341 ) The U.S 1941 131.3mil ( 341 vessels ), 1945 427.2mil ( 918 )

JIA 1941 4,772 1945 10,938 The U.S 1941 12,240 1945 40,810

JIA 1940 30 million tons 1945 22mil The U.S 1940 18,286.7 mil 1945 23,175 mil

JIA 1940 365.8 million tons 1945 103.9 mil The U.S 1940 4,302.7mil 1945 4,985.5 mil

  1. From this source

Data comparison ( From 1941 to 1945 )

JIA

1941 2.42 million

1945 8.26 million

The U.S

1941 1.88 million

1945 12.297 million

( Hereunder let me call million --> mil ( and the abbreviated explanation will be subject to the former ( 1941's ))

JIA

1941 148mil tons ( The number of vessels 385 ),

1945 70.8 mil ( 341 )

The U.S

1941 131.3mil ( 341 vessels ),

1945 427.2mil ( 918 )

JIA

1941 4,772

1945 10,938

The U.S

1941 12,240

1945 40,810

JIA

1940 30 million tons

1945 22 mil

The U.S

1940 18,286.7 mil

1945 23,175 mil

JIA

1940 365.8 million tons

1945 103.9 mil

The U.S

1940 4,302.7mil

1945 4,985.5 mil

1
source | link

I think the possible answer could fall into how to tread the OP's word "capable of maintaining the war"....

Thus I would like to analyze between the "material capability side" and the "spiritual capability side".

Material Capability Side

  1. From this source

    Data comparison ( From 1941 to 1945 )

The number of soldiers ( including civilian related employees of each army )

JIA 1941 2.42 million 1945 8.26 million The U.S 1941 1.88 million 1945 12.297 million

( Hereunder million --> mil ( and the abbreviated explanation will be subject to the former ( 1941's ))

The number of ships ( including small size ships )

JIA 1941 148mil tons ( The number of vessels 385 ), 1945 70.8 mil ( 341 ) The U.S 1941 131.3mil ( 341 vessels ), 1945 427.2mil ( 918 )

The number of airplanes

JIA 1941 4,772 1945 10,938 The U.S 1941 12,240 1945 40,810

The shift of volume of critical materials ( This site looks first funny but if you follow the link, you can find the numbers ( but the difference between 1940 and 1945 )

Oil

JIA 1940 30 million tons 1945 22mil The U.S 1940 18,286.7 mil 1945 23,175 mil

Iron

JIA 1940 365.8 million tons 1945 103.9 mil The U.S 1940 4,302.7mil 1945 4,985.5 mil

So, I was able to find only some critical materials and military power in terms of the comparison and time shift, --- apparently from the first and foremost there were huge gap between the JIA and the U.S and in 1945 the gap widened helplessly.

Spiritual Capability side

Why I would like to this was because of the mentality among Japanese then, who almost made a determination to fight even if they die in case the U.S force would have landed on the homeisland. The above link, is explaining Ketsugou Sakusen, in English Operation Ketsugo, almost equivalent to the whole Kamikaze attack by the whole Japanese.

Since ( I don't know the reason why ) I can not copy the Chinese characters, so I can not copy the original sentence, but if you believe in me, according to the above link,

  1. JIA already expected the U.S forces would land on the homeisland around the fall of 1945, already in early 1945 which coincidentally same with the expected first strike by the Operation Downfall by the U.S army.

  2. Now let's take a look at the Japanese site ( about the operation Ketsugou )

You can see the number 2800, even if you can not read Japanese.

This is the number of Kokumin Giyu Sentotai, in English, Volunteer Fighting Corps, ( and the link is in English ), which is a civilian forces, and as the link says

The Kokumin Giyū Sentōtai would be organized, if the Allied landing unit close to the Japanese homeland. Governors of Prefectures could conscript all male civilians between the ages of 15 to 60 years, and unmarried females of 17 to 40 years

Conclusion

So I think you might have been able to picture some kind of image what kind of situation the then Imperial Japan was at.

Conscripting men from 15 years old to 60 and women from 17 years old to 40, respectively? Considering the number of the entire population then ( including that of Korea, and Manchuria, ) was around 80million, I would like to call this "operation" was an "entire Kamikaze defense" by the then Imperial Japanese.

So in terms of the production of materials and army capability, it was almost impossible, but when considering the huge loss of the U.S soldiers by the above mentioned "entire Kamikaze attack", well, I might be able to say the JIA was --capable-- to defend or fight.

Have a nice day.