Java Programming Idea: The 4th Chapter controls the execution flow

4.1 True and False

All conditional statements are judged by true and false.

4.2 If-else

if (BOOL-EXP) statement; or if (BOOL-EXP) statement; else statement;

4.3 iterations

while (b) {} do{}while (b)

for (init;b;step) {}init You can define multiple initial variables with commas

4.4 foreach Syntax

Enhanced for loop for (T T: Collection/array) {}

4.5 Return

4.6 Break and continue

Any iteration statement body can use break and continue to control the loop flow.

can be used with tags: interrupts the loop until the label is in place.

Note: The only reason to use tags in Java is because there is a loop nesting, and you want to break or continue from multiple nested nesting;

4.7 Infamous Goto

4.8 Switch

Depending on the integer expression, you can choose one from a series of code to execute.

Switch (INT-EXP) {

Case Int-val1:st1; Break

...

DEFAULT:SN;

Integer expressions include byte, short, char, int , and encapsulated classes and enums

Note: Starting with 1.7 string can also be, the principle is to convert a string to hashcode as an int to handle

}

Java Programming Idea: The 4th Chapter controls the execution flow