The if Statement

if (x < y)
{y = 0;x = x + 1;
}
else
{x = y;
}

 

if (x < y)
{y = 0;x = x + 1;
}

 

The if-return Statement 

if (x < y)
{return;
}
print (x);
return;

 

 注意：2到3 没有边

while and for Loops

x = 0;
while (x < y)
{y = f (x, y);x = x + 1;
}

for (x = 0; x < y; x++)
{y = f (x, y);
}

 

 do Loop, break and continue

x = 0;
do
{y = f (x, y);x = x + 1;
} while (x < y);
println (y)

x = 0;
while (x < y)
{y = f (x, y);if (y == 0){break;} else if (y < 0){y = y*2;continue;}x = x + 1;
}
print (y);

 

The Case (switch) Structure

read ( c) ;
switch ( c )
{case ‘N’:y = 25;break;case ‘Y’:y = 50;break;default:y = 0;break;
}
print (y);

 

read ( c) ;
switch ( c )
{case ‘N’:y = 25;break;case ‘Y’:y = 50;default:y = 0;break;
}
print (y);

 

The Exception (try-catch) Structure

try
{s = br.readLine();if (s.length() > 96)throw new Exception(“too long”);
} catch IOException e) {e.printStackTrace();
} catch Exception e) {e.printStackTrace();
}
return (s);