Keywords for Java

While and for can be interchanged.
The difference is that if you need to define a variable control loop number. It is recommended to use for. Because the For loop is complete, the variable is freed in memory.
Break: Acts on a switch, and a loop statement, used to jump out, or to be called an end.

When a break statement exists separately, the following do not define other statements, because the compilation fails because it is not executed. When a loop is nested, break only jumps out of the current loop. To jump out of a nested outer loop, just give the loop a name, which is called a label.
Continue: Only for loop structure, continue to recycle.
Effect: End this cycle and continue the next cycle. When the statement is present alone, the statement below cannot be defined and cannot be executed.

Keywords for Java