14.15

The

return

 Statement

BLOCKS AND STATEMENTS

class Graph {

. . .

public Graph loseEdges(int i, int j) {

int n = edges.length;

int[][] newedges = new int[n][];

edgelists: for (int k = 0; k < n; ++k) {

int z;

search: {

if (k == i) {

. . .

} else if (k == j) {

. . .

}

newedges[k] = edges[k];

continue edgelists;

}//search

. . .

}//edgelists

return new Graph(newedges);

}

}

Which to use, if either, is largely a matter of programming style.

14.15   The

return

 Statement

A

return

 statement returns control to the invoker of a method ( 8.4,  15.11) or

constructor ( 8.6,  15.8).

ReturnStatement:

return

Expression

opt

 ;

A

return

 statement with no

Expression

must be contained in the body of a

method that is declared, using the keyword

void

, not to return any value ( 8.4), or

in the body of a constructor ( 8.6). A compile time error occurs if a

return

 state 

ment appears within a static initializer ( 8.5). A

return

 statement with no

Expression

 attempts to transfer control to the invoker of the method or constructor

that contains it. To be precise, a

return

 statement with no

Expression

 always

completes abruptly, the reason being a

return

 with no value.

A

return

 statement with an

Expression

 must be contained in a method decla 

ration that is declared to return a value ( 8.4) or a compile time error occurs. The

Expression

 must denote a variable or value of some type

T

, or a compile time

error occurs. The type

T

 must be assignable ( 5.2) to the declared result type of

the method, or a compile time error occurs.

286