When use read user's input from standard input device ,i want show it as '*' .How can i do ?

Question

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Answer 1

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Answer 2

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afds
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fd
fdas
dafs
afds
adfs
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ads
dsfa
dsfa
dfs
dsfa
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sdf
sd
dsfa
fds
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fdsa
df
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fd
dfsd
sf
dsf
dsf
dsf
dfsdf
ds
ds
ds
ds
dsf
dsf
as

Answer 3

aa
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Answer 4

Tell me your solution after you break it ! 
OICQ:22181113

Answer 5

拉一拉！
我在试setOut，按照JDK说明应该是可以的

Answer 6

csdn人的力量 ！！！！！！！