java配列

int[]a;// 初期化しないint[]a=newint[5];// ０で初期化int[][]a=newint[2][3];// 二次元配列

int[]a={1,2,3};// 長さ3int[][]a={{1,2},{3,4}};// 二次元の初期化f(newint[]{1,2,3});// 関数の引数として by @saka1029

a.lengtha[0].length// 二次元の場合

a[n];a[i][j];// 二次元の場合

importjava.util.Arrays;classRec{Stringstr;publicRec(Strings){str=s;}publicStringtoString(){returnstr;}}publicclassMain{publicstaticvoidmain(String[]args){int[]a={1,2,3};int[]b=a.clone();a[1]=7;System.out.println("a="+Arrays.toString(a)+" b="+Arrays.toString(b));String[]c={"a","b","c"};String[]d=c.clone();c[1]="7";System.out.println("c="+Arrays.toString(c)+" d="+Arrays.toString(d));Rec[]e={newRec("e"),newRec("f"),newRec("g")};Rec[]f=e.clone();Rec[]g=newRec[3];Rec[]h=Arrays.copyOf(e,5);Rec[]i=Arrays.copyOfRange(e,2,4);System.arraycopy(e,0,g,0,g.length);e[0]=newRec("7");e[1].str="8";g[2].str="9";System.out.println("e="+Arrays.toString(e)+" f="+Arrays.toString(f)+" g="+Arrays.toString(g)+" h="+Arrays.toString(h)+" i="+Arrays.toString(i));}}

a=[1, 7, 3] b=[1, 2, 3]　             <== b[1]は2のまま
c=[a, 7, c] d=[a, b, c]               <== d[1]はbのまま
e=[7, 8, 9] f=[e, 8, 9] g=[e, 8, 9] h=[e, 8, 9, null, null] i=[9, null]　　<== f[0]はeのまま、f[1], g[1] は変わる、e[2],f[2],g[2]は変わる

for(inti=0;i<a.length;i++){// do sth. here}

importjava.util.Arrays;int[]a={1,2,3};System.out.prontln("a="+Arrays.toString(a));int[][][]j={{{1,2},{3,4},{5,6}},{{7,8},{9,10},{11,12}}};System.out.println("j="+j+" aj="+Arrays.toString(j)+" deepJ="+Arrays.deepToString(j));

a=[1, 2, 3]  
j=[[[I@2a139a55 aj=[[[I@15db9742, [[I@6d06d69c] deepJ=[[[1, 2], [3, 4], [5, 6]], [[7, 8], [9, 10], [11, 12]]]